A school boy lying on the ground 30m away from the foot of a water tank tower observes that the angle of elevation of the top of the tank 60

^{o}. Calculate the height of the water tank.-
**A.**

60m -
**B.**

30 (sqrt{3})m -
**C.**

20 (sqrt{3})m -
**D.**

10 (sqrt{3})m

##### Correct Answer: Option B

##### Explanation

h = 30 tan 60^{o}

= 30(sqrt{3})