Answer:
c = 144°
Step-by-step explanation:
a + b = 90° right - angle
Given a : b = 2:3
Total ratio = 2 + 3 = 5
angle a = 2/5 × 90° = 36°
angle b = 90° - a = 90° - 36°
= 54°
Angle MOY = Angle XON (vertically opposite angles)
a + 90° = c
c = 54° + 90°
c = 144°