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A set of questions on circle theorems to challenge you!
Typology: Exercises
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Diagram NOT accurately drawn In the diagram, A , B , C and D are points on the circumference of a circle, centre O. Angle BAD = 70°. Angle BOD = x °. Angle BCD = y °. (a) (i) Work out the value of x. (ii) Give a reason for your answer. (2) (b) (i) Work out the value of y. (ii) Give a reason for your answer. (2) (Total 4 marks) 2. P , Q , R and S are points on the circumference of a circle, centre O. PR is a diameter of the circle. Angle PSQ = 56°. (a) Find the size of angle PQR. Give a reason for your answer. (2) (b) Find the size of angle PRQ. Give a reason for your answer. (2) (c)Find the size of angle POQ. Give a reason for your answer. (2) (Total 6 marks) 3.
The diagram shows a circle, centre O. AC is a diameter. Angle BAC = 35°. D is the point on AC such that angle BDA is a right angle. (a) Work out the size of angle BCA. Give reasons for your answer. (2) (b) Calculate the size of angle DBC. (1) (c) Calculate the size of angle BOA. (2) (Total 5 marks) 4. A, B, C and D are points on the circumference of a circle, centre O. BOD is a straight line. Angle COD = 70° (a) Find the size of angle BAD. Give a reason for your answer. (2) (b) Find the size of angle CBD. Give a reason for your answer. (2) (Total 4 marks)
Diagram NOT accurately drawn A,B,C and D are points on the circle, centre O. Angle BOD = 86º (a) Work out the size of angle BAD. Give a reason for your answer. (2) (b) Work out the size of angle BCD. (1) (Total 3 marks) 8. A,B,C and D are points on a circle, centre O. Angle BOD = 116° (a) Calculate the size of angle BAD. (1) Given that BC = CD. (b) Calculate the size of angle DBC. (2) (Total 3 marks) 9. A , B , C and D are four points on the circumference of a circle. ABE and DCE are straight lines. Angle BAC = 25°. Angle EBC = 60°. (a) Find the size of angle ADC. (1) (b) Find the size of angle ADB (2) Angle CAD = 65°. Ben says that BD is a diameter of the circle. (c) Is Ben correct? You must explain your answer. (1) (Total 4 marks)