In diagram, PQ || ST and < PQR = 120º, < RST = 130º, find the angle marked x
Attached Figure / Diagram
A
50
B
65
C
70
D
80
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
Produce line PQ to meet line RS at U
< RQU = 180º - 120º = 60º (
In angle QRU: < QPT + RQU = < RUV ( 2 interior angles = one exterior angle)
x + 60º = 130º and x = 70º
Source: WAEC / JAMB / NECO Classroom Archive (Record #33077)