If the ratio of the circumference of the base of a right circular cone – McqOptions

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1.	If the ratio of the circumference of the base of a right circular cone of radius r to its height is 3 : 1, then what is the area of the curved surface of the cone?
A.	3πr2
B.	[2πr2 √(4π2 + 9)]/3
C.	[πr2 √(π2 + 1)]/3
D.	[πr2 √(4π2 + 9)]/3
Answer» E.

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