The angle of elevation of an aircraft from a point K on the horizontal ground...
MATHEMATICS
WAEC 2015
The angle of elevation of an aircraft from a point K on the horizontal ground 30°. If the aircraft is 800m above the ground, how far is it from K?
- A. 400.00m
- B. 692.82m
- C. 923.76m
- D. 1,600.99m
Correct Answer: D. 1,600.99m
Explanation
In \(\bigtriangleup\)KBC, sin 30 = \(\frac{800}{IKCI}\)
IKCL = \(\frac{800}{sin30^o}\)
= \(\frac{800}{0.5}\)
= 1600m
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