From the top of a building 10m high, the angle of depression of a stone...

WAEC 1990

From the top of a building 10m high, the angle of depression of a stone lying on the horizontal ground is 69^o. Calculate ,correct to one decimal place, the distance of the stone from the foot of the building

A. 3.6m
B. 3.8m
C. 6.0m
D. 9.3m
E. 26.1m

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Correct Answer: Option B

Explanation

tan21^o =x/10
x = 10 tan 21^o
= 3.3839 = 3.8m

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Correct Answer: Option B

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