Complete the statements below. The sum of the interior angle measures of a triangle must be []. So, m∠1 +...

Complete the statements below.
The sum of the interior angle measures of a triangle must be [].
So, m∠1 + m∠2 + m∠3 = [].
We are given that m∠3 = 57°.
So, m∠1 + m∠2 = [].
From the figure, we can see that m∠3 + m∠4 = [].
Since m∠3 = 57°, it must be that m∠4 = [].
Therefore, m∠4 [] m∠1 + m∠2.
This result is an example of the Exterior Angle Property of Triangles.
For any triangle, the measure of an exterior angle