Q. 73.5( 4 Votes )
If the radius of the base of a right circular cone is 3r and its height is equal to the radius of the base, then its volume is
A. 
πr3
B. 
πr3
C. 3πr3
D. 9πr3
Answer :
We have,
Radius of base of cone = 3r
Height of cone = 3r
Volume of cone = 
= 9πr3
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