The perimeter of the base of a right circular cone is 8

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The perimeter of the base of a right circular cone is 8 cm. If the height of the cone is 21 cm, then its volume is:

2πr = 8 ⇒ πr = 4

⇒ r =	4
	π

∴ V =	1	πr²h -	1	π ×	4 × 4	× 21 =	112	cu.cm.
	3		3		π × π		π

	112	cm³
	π

	108	cm³
	π