A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is:

• 12Π cm3
• 15Π cm3
• 16Π cm3
• 20Π cm3

Correct Answer: 12Π cm3

Explanation:

Clearly, we have r = 3 cm and h = 4 cm.

∴ Volume =	1	Πr2h =	❨	1	x Π x 32 x 4	❩cm3	= 12Π cm3.
	3			3