In the given figure, AB is parallel to CD. What is the value (in degrees) of x?
Show answer & explanation
Correct answer: A
Explanation
Given:
AB ∥ CD; Upper angle = 100°; Lower angle = 140°
According to the formula:
Relationship between interior angles in parallel lines
Interior angle on the upper line = 180° − 100° = 80°
Interior angle on the lower line = 180° − 140° = 40°
x = 80° + 40° = 120°