Question

what is m∠1? m∠1=□°

Explanation:

Step1: Apply the exterior angle theorem

The exterior angle theorem states that an exterior angle of a triangle is equal to the sum of the two non - adjacent interior angles.

Step2: Calculate \(m\angle1\)

Given the two non - adjacent interior angles are \(20^{\circ}\) and \(40^{\circ}\). Then \(m\angle1=20 + 40\).

Answer:

\(60\)