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In the diagram above, ∠PRQ = 90°, ∠QPR = 30° and /PQ/ = 10 cm. Find...

Mathematics
WAEC 1995

In the diagram above, ∠PRQ = 90°, ∠QPR = 30° and /PQ/ = 10 cm. Find y.

  • A. 6cm
  • B. 5cm
  • C. 4cm
  • D. 3cm
  • E. 2cm
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Correct Answer: Option B
Explanation

\(\sin 30° = \frac{y}{10}\)

\(y = 10 \sin 30° = 10 \times 0.5 = 5 cm\)

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