Question

If m∠A =91° and m∠B = 40°, find m∠1.

Answer 1

m∠1 is calculated as 49°.

Explanation:

Consider the angles are the interior angles of a triangle.

m∠A =91°

m∠B = 40°

m∠1 = ?

We know that the sum of interior angles of a triangle is 180°. So,

m∠A + m∠B + m∠1 = 180°

or, m∠1 = 180°- m∠A - m∠B

or, m∠1 = 180°- 91° - 40°

or, m∠1 = 49°

Hence, m∠1 = 49°.