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:

1.

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:

[A].	12 cm3
[B].	15 cm3
[C].	16 cm3
[D].	20 cm3

Answer: Option A

Explanation:

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

Volume =	1	r²h =		1	x x 3² x 4	cm³	= 12 cm³.
	3			3

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