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∠3 + m∠4 = [].
We are given that m∠3 = 50°. So, m∠1 + m∠4 = [].
From the figure, we can see that m∠2 + m∠3 = []. Since m∠3 = 50°, it must be that m∠2 = [].
Therefore, m∠2 [] m∠1 + m∠4.
This result is an example of the Exterior Angle Property of Triangles. For any triangle, the measure of an exterior angle