In the diagram PQRS is a circle, |PT| = |QT| and ∠QPT = 70o what is the size of ∠PRS?
Attached Figure / Diagram
A
40o
B
70o
C
80o
D
140o
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
∠QPT = ∠QTP = 70o. Since ∠QTR = 140o
∠PRS = TSR = 1/2(180-40) = 70o
Source: Myschool Past Questions Archive (Record #26708)