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When an aeroplane is 800m above the ground, its angle of elevation from a point...

Mathematics
WAEC 1998

When an aeroplane is 800m above the ground, its angle of elevation from a point P on the ground is 30o. How far is the plane from P by line of sight?

  • A. 400m
  • B. 800m
  • C. 1500m
  • D. 1600m
  • E. 1700m
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Correct Answer: Option D
Explanation

From the diagram, \(\sin 30 = \frac{800}{x}\)

\(x = \frac{800}{\sin 30} \)

= \(\frac{800}{0.5} \)

= 1600 m

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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