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Calculate the value of x in the diagram above

Mathematics
WAEC 1988

Calculate the value of x in the diagram above

  • A. 18o
  • B. 30o
  • C. 40o
  • D. 60o
  • E. 15°
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Correct Answer: Option E
Explanation

vertically opposite angles are equal, hence

3x + 6x + 3x = 180°

12x = 180°

x = 15°

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