Answer:
34°
Explanation:
You know the following relationships are true:
- A+C = 90
- G+E = 90
- C+D+E = 180
Using the first two equations, you can write expressions for C and E, then substitute those into the last equation:
C = 90 - A
E = 90 - G
(90 -A) + D + (90-G) = 180
A = D - G . . . . . . . add A-180 to both sides
A = 71° -37°
A = 34°