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 105° be 65° and ∠1. So, 105°=65° + m∠1.

Step2: Solve for m∠1

m∠1=105°−65°

Answer:

40