In the diagram above, AO is perpendicular to OB. Find x
- 7.5o
- 15o
- 22.5o
-
30o
- 38.6o
The correct answer is: D
Explanation
4x + 3x + 2x + 90 =360° [angle at a point]
9x + 90 = 360°
9x = 360° - 90°
9x = 270
x = 270/9
x = 30°