PQRS isa cyclic quadrilateral which PQ = PS. PT is a tangent to the circle and PQ makes an angle of 50o with the tangent as shown in the figure. What is the size of QRS?
A.
50o
B.
40o
C.
110o
D.
80o
E.
100o
Correct answer is E
< SPQ = 80o
< SPQ + < SRQ = 180(Supplementary)
80 +
< QRS = 180o - 80o
= 100o