A solid metallic spherical ball of diameter 6 cm is melted and recast into a cone with diameter of the base as 12 cm. The height of the cone is : Choose the correct choice from the following answers:
A) 8 cm	B) 6 cm	C) 4 cm	D) 3 cm	E) None
Sol.   Let the height of the cone be h cm. Then,   1/3 ∏ * 6 * 6 * h = 4/3 ∏ * 3 * 3* 3 ⇒   h = [36 * 3 / 36= 
<gadget id="calculator">36 * 3 / 36</gadget>
<output>3</output>
3 cm.   Answer 3 cm
<result>D</result>
A solid metallic spherical ball of diameter 6 cm is melted and recast into a cone with diameter of the base as 12 cm. The height of the cone is :