Question

what is m∠1? m∠1 =

Explanation:

Step1: Use exterior - angle property

The exterior - angle of a triangle is equal to the sum of the two non - adjacent interior angles. Let the non - adjacent interior angles to the exterior angle of 131° be ∠1 and 57°. So, 131°=m∠1 + 57°.

Step2: Solve for m∠1

m∠1=131°−57°.
m∠1 = 74°.

Answer:

74