Question

what is the value of r?

Explanation:

Step1: Identify angle - relationship

The larger angle is composed of two non - overlapping angles.

Step2: Use angle - addition property

We know that if an angle is composed of two non - overlapping angles, the measure of the larger angle is the sum of the measures of the two smaller angles. So $r=45^{\circ}- 28^{\circ}$.

Step3: Calculate the value of $r$

$r = 17^{\circ}$

Answer:

$17$