WAEC Mathematics 2015 Question 25

Question 25

Trigonometry

The angle of elevation of an aircraft from a point K on the horizontal ground is 30° if the aircraft is 800m above the ground, how far is it from K?

  1. A.400.00m
  2. B.692.82m
  3. C.923.76m
  4. D.1,600.00m
Show the answer and explanation

Answer: D (1,600.00m)

Explanation

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