The measure of the angles are ;
angle 1 = 55°
angle 2 = 60°
angle 3 = 30°
angle 4 = 65°
A triangle is a three sided polygon. The sum of angle in a triangle is 180°.
angle 1 and 125 are adjascent angles
angle 1 = 180 - 125
angle 1 = 55°
angle 2 + 90 + 30 = 180
angle 2 = 180 -(90+30)
angle 2 = 180 - 120
angle 2 = 60°
angle 3 = 180 - ( 90 + 60)
angle 3 = 180 - 150
angle 3 = 30°
angle 1 + angle 2 + angle 4 = 180°
55 + 60 + angle 4 = 180
angle 4 = 180 - 115
angle 4 = 65°