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

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

Correct Answer: Option B

Explanation

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