Question

Copy each of the following triangles. In each case verify that an exterior angle of a triangle is equal to the sum of the two interior opposite angles.

Answer 1

From the figures exterior 

∠B = ∠A + ∠C 

∠130° = 65° + 65° 

∠PQS = ∠P + ∠R also ∠YZO = ∠X 

90° = 40° + 50° 120° = 90° + 30°