Let the angle be x
180°- x = 5 units ----(1)
90°- x = 2 units ----(2)
(1) - (2)
90° = 3 units
1 unit = 30°
Substitute 1 unit = 30° into Eqn 1
180° - × = 150°
x = 30°
Note: this method is using the method of simultaneous equation
it can be solvedusing other methods
