in the diagram above, calculate the value of x.
Attached Figure / Diagram
A
60o
B
100o
C
120o
D
140o
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
FROM the diagram above
100 + a = 180 (sum of angles on a straight line)
a = 180 - 100 = 80º
Z = 80 + 40 = 120º (exterior angles of a triangle = sum of the two opp. interior angles)
Z = x = 120º (corresponding angles are equal).
Source: Myschool Past Questions Archive (Record #33120)