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Standard X
Mathematics
Right Circular Cone and Its Surface Area
The radius of...
Question
The radius of the base of a right circular cone is 21 cm and its height is 20 cm. Find its volume.
A
3300
c
m
3
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B
1914
c
m
3
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C
1386
c
m
3
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D
9240
c
m
3
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Solution
The correct option is
D
9240
c
m
3
Given: Radius of the cone, r = 21 cm
Height of the cone, h = 20 cm
Volume of cone =
1
3
π
r
2
h
=
1
3
×
22
7
×
21
×
21
×
20
=
22
×
21
×
20
=
9240
c
m
3
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