The base diameter of a cone is 14cm, and its volume is 462 cm

^{3}. Find its height. [Taken (pi = frac{22}{7})]-
**A.**

3.5cm -
**B.**

5cm -
**C.**

7cm -
**D.**

9cm

##### Correct Answer: Option D

##### Explanation

From (V = frac{1}{3}pi r^2 h. hspace{1mm} r =frac{14}{2}\

462 = frac{1}{3} times frac{22}{7} times 7^2 times h \

h = frac{3 times 462}{22 times 7}\ h = 9)