Question

If angle 1 = 145°, and angle 2 = 40°, show that angle 3 = 105°. (PICTURE BELOW)

Answer 1

You know there is 180 degrees on a line so angle TUS is 35.

You also know the sum of a triangles angles is 180, so 40 + 35 + angle 3 = 180.

This means angle 3 = 180 - (40+35)

or angle 3 = 105

Explanation: