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WAEC Mathematics 1988 Question 35

Question 35

Trigonometry

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

  1. A.400m
  2. B.800m
  3. C.1500m
  4. D.1600m
  5. E.1700m.
Show the answer and explanation

Answer: D (1600m)

Explanation

sin 30° = 800/d, so d = 800 ÷ 0.5 = 1600 m.