In the diagram, QR//ST, /PQ/ = /PR/ and o. Find the value of y
Attached Figure / Diagram
A
105o
B
110o
C
130o
D
150o
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
In \(\bigtriangleup\) PQR,
Q = S = 75o (Corresponding angle)
R = Q = 75o (Base angles of an isosceles \(\bigtriangleup\))
But, y + 75o = 180o (Sum of angles in a straight line)
y = 180 - 75
y = 105o
Source: Myschool Past Questions Archive (Record #36602)