Question

first, write an expression for the sum of the angle measures of the triangle.

Explanation:

Step1: Identify angle measures

The triangle has angles \( \angle 1 \), \( \angle 2 \), and \( \angle 3 \) with measures \( m\angle 1 \), \( m\angle 2 \), \( m\angle 3 \).

Step2: Sum the angle measures

To find the sum, we add the measures of the three angles. So the expression is \( m\angle 1 + m\angle 2 + m\angle 3 \).

Answer:

\( m\angle 1 + m\angle 2 + m\angle 3 \)