In the diagram below, AO is perpendicular to OB. Find x
MATHEMATICS
WAEC 1995
In the diagram below, AO is perpendicular to OB. Find x
- A. 7.5°
- B. 15°
- C. 22.5°
- D. 30°
Correct Answer: D. 30°
Explanation
4x + 3x + 2x + 90 =360° [angle at a point]
9x + 90 = 360°
9x = 360° - 90°
9x = 270
x = 270/9
x = 30°
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