Question

In ΔABC, if ∠A = 40° and ∠B = 70°, find the measure of exterior angle at A.

• A. 140°
• B. 110°
• C. 70°
• D. 30°

Answer 1

Answer:

A. 140°

The exterior angle is equal to the sum of the two opposite interior angles. Thus ,exterior angle at A = 70° + 70° = 140°.