From the top of a building 10m high, the angle of depression of a stone...
MATHEMATICS
WAEC 1990
From the top of a building 10m high, the angle of depression of a stone lying on the horizontal ground is 69°. 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
Correct Answer: B. 3.8m
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tan21=x/10 x=10 tan 21 x=3.838 x~3.8