Mathematics

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 69o. 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

tan21o =x/10
x = 10 tan 21o
= 3.3839 = 3.8m