PQ is parallel to RS. Calculate the value of x.
A.
20o
B.
40o
C.
60o
D.
80o
E.
100o
Correct answer is B
< D = 180o - 100v
= 80o (< on a str. line)
< s = 60o - alternate angle
x = 180o - (80o + 60o)
180o - 140o = 40o