PQ is parallel to RS. Calculate the value of x.
Attached Figure / Diagram
A
20o
B
40o
C
60o
D
80o
E
100o
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
< D = 180º - 100º
= 80º (< on a str. line)
< S = 60º - alternate angle
x = 180º - (80º + 60º)
180º - 140º = 40º
Source: Myschool Past Questions Archive (Record #32740)