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Question 1 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 2 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 3 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 4 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 5 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 6 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 7 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 8 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 9 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 10 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 11 of 50
-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 12 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 13 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 14 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 15 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 16 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 17 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 18 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 19 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 20 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 21 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 22 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 23 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 24 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 25 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 26 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 27 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 28 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 29 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 30 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 31 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 32 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 33 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 34 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 35 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 36 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 37 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 38 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 39 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 40 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 41 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 42 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 43 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 44 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
-
Question 45 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
-
Question 46 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
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Question 47 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

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⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).
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Question 48 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
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Question 49 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles and lie around a point (a full rotation).
If, in the diagram, , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If two angles x and y meet at a point, they share a full turn, so x + y = 360°.
To find the unknown angle, rearrange: x = 360° − y (or y = 360° − x).
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Question 50 of 50
Topic: Angles on a Full Rotation. 
Please have pen and paper handy to show workings out. 📝
📐 In the diagram, angles , , and lie around a point (a full rotation).
If, in the diagram, and , calculate angle .
State your answer in degrees.

-
⌨️ Enter your answer in the field provided.
💡 Key fact: angles around a point add up to 360°.
If three angles x, y, and z meet at a point, they share a full turn, so x + y + z = 360°.
To find the unknown angle, rearrange: x = 360° − y − z (or similarly for the one you need).