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In the diagram above, AO is perpendicular to OB. Find x

Mathematics
WAEC 1995

In the diagram above, AO is perpendicular to OB. Find x

  • A. 7.5o
  • B. 15o
  • C. 22.5o
  • D. 30o
  • E. 38.6o
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Correct Answer: Option D
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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