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Standard IX
Mathematics
Volume of a right circular cone
Question
Two cones have their heights in the ratio
1
:
3
and their radii in the ratio
3
:
1
. Find the ratio of their volumes.
2:1
9:1
3:1
1:1
A
3:1
B
1:1
C
2:1
D
9:1
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Solution
Verified by Toppr
Given:
h
1
:
h
2
=
1
:
3
r
1
:
r
2
=
3
:
1
V
1
V
2
=
(
1
3
)
π
r
2
1
h
1
(
1
3
)
π
r
2
2
h
2
=
(
3
1
)
2
.
1
3
=
3
1
Hence, option C is correct.
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