In this figure, PQRS is a parallelogram, PS = PT and < PST = 55\(^o\). The size of
Attached Figure / Diagram
A
125o
B
120o
C
115o
D
110o
E
10o
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
Both pairs of opp. angles are equal
< STP = 55\(^o\) - isosceles angle
< TSR = 55\(^o\) - alternate angle to < STP
Hence, < PSR = 55\(^o\) + 55\(^o\) = 110\(^o\)
\(\therefore\) < PQR = 110\(^o\)
Source: Myschool Past Questions Archive (Record #32734)