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Circle Theorems: Quiz 1 – Answers
Circle Theorems: Quiz 1 – Answers
1) Angle: 120°
Reason: the angle subtended by an arc at the centre is twice the angle subtended at the circumference.
2) 70°
3) 2x + 40°
4) 2y – 15
Reason: the angle subtended by an arc at the centre is twice the angle subtended at the circumference.
2) 70°
3) 2x + 40°
4) 2y – 15
Working
Questions
Do not use a calculator for the following questions. All of the diagram in the questions are not drawn to scale.
1) What is the size of the angle marked x? Give a reason for your answer.
Do not use a calculator for the following questions. All of the diagram in the questions are not drawn to scale.
1) What is the size of the angle marked x? Give a reason for your answer.
2) What is the size of angle y?
3) What is the size of the angle AOB?
4) Angle AOB is 4y – 30. What is the size of angle ACB?