Question

1. find m∠1. 57° 132° 93° 123°

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.
For the given triangle, \(\angle1\) is an exterior angle. The two non - adjacent interior angles are \(60^{\circ}\) and \(63^{\circ}\).

Step2: Calculate \(\angle1\)

$$
LATEXBLOCK0
$$

Answer:

\(123^{\circ}\)