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

##### Correct Answer: Option B

##### Explanation

tan21^{o} =x/10

x = 10 tan 21^{o}

= 3.3839 = 3.8m