It's a pentagon, so each central angle like angle 1 is 360/5=72 degrees. So angle 2 is half that, 36 degrees. Angle 3 is complementary to that 90-36=54 degrees.
Last choice, 54°
sum of interior angles in a pentagon = 180(n - 2)
= 180(5 - 2)
= 180(3)
= 540
There are 6 equal angles in a pentagon
540 / 6 = 108
<3 = 1/2(108) = 54
answer:
D. 54
