Question

If the measure of angle 5 is 120°, and the measure of angle 4 is represented by (4x +20)", what is the value X

Answer 1

25°

Explanation:

Since a is parallel to b, angle 4 = angle 5 since they are alternate angles

Therefore 120°=4x+20°

120°-20°=4x

100°=4x

x=25°