Question

Given the following diagram, find the required measure.

Given: 711 m
m1 = 140°
m3 = 50°​

Answer 1

∠ 4 = 130°

Explanation:

∠ 3 and ∠ 4 are adjacent angles and supplementary, thus

∠ 3 + ∠ 4 = 180°, that is

50° + ∠ 4 = 180° ( subtract 50° from both sides )

∠ 4 = 130°