From the top of a cliff 20m high, a boat can be sighted at sea...
MATHEMATICS
WAEC 1999
From the top of a cliff 20m high, a boat can be sighted at sea 75m from the foot of the cliff. Calculate the angle of depression of the boat from the top of the cliff
- A. 14.9o
- B. 15.5o
- C. 74.5o
- D. 75.1o
Correct Answer: A. 14.9o
Explanation
\(\tan x = \frac{20}{75} = 0.267\)
\(x = \tan^{-1} 0.267 = 14.93°\)
\(\approxeq\) 14.9°
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