Question 211998MathematicsJAMB

In the diagram below, PR is a diameter of the circle PQRS. PST and QRT are straight lines find ∠QSR.

Question illustration
A

20°

B

25°

C

30°

D

35°

Step-by-Step Explanation

In a circle, the angle subtended by a diameter at the circumference is always a right angle. Therefore, triangle QSR, where PR is the diameter, has angle QSR as half of the angle subtended by the arc PQ, which is 50°. This results in angle QSR being 25°.

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