The angle of elevation of the top of a cliff 15 meters high from a landmark is 60

^{o}. How far is the landmark from the foot of the cliff? Leave your answer in surd form-
**A.**

(15sqrt{3}m) -
**B.**

(15sqrt{2}m) -
**C.**

(10sqrt{3}m) -
**D.**

(5sqrt{3}m)

##### Correct Answer: Option D

##### Explanation

(tan 60^{circ} = frac{15}{x} Rightarrow x = frac{15}{tan60^{circ}\

x = left(frac{15}{sqrt{3}} times frac{sqrt{3}}{sqrt{3}}right)m Rightarrow 5sqrt{3}m)