Question

Find the measure of ∠A.

Answer 1

The measure of angle a is:

Answer 2

Sum of angles in a rectangle = 360°

Sum of angles in a triangle = 180°

Sum of triangle + rectangle angles = 360 + 180 = 540°

90°+90°+x+15+x+x+21 = 540 °

216°+ 3x = 540°

3x = 324 °

x = 108 °

<A=x+15=108+15=123°