Question

Find m+n of this angle.

Answer 1

m + n = 140°

Explanation:

∵ The measure of the angle next to n = 40° ⇒ vertically opposite angle with the angle 40°

From parallel lines m , n and angle 40° next to n are interior supplementary means their sum is 180°

∴ m + n + 40° = 180°

∴ m + n = 180 - 40 = 140°