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

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

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

waec 1990 mathematics

The correct answer is B. 3.8m

tan21^o =x/10

x = 10 tan 21^o

= 3.3839 = 3.8m

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