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Byju's Answer
Standard IX
Mathematics
Volume of a right circular cone
If the radius...
Question
If the radius and slant height of a cone are
20
c
m
and
29
c
m
respectively. Find its volume.
A
8800
c
m
3
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B
800
c
m
3
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C
880
c
m
3
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D
None of these
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Solution
The correct option is
A
8800
c
m
3
We have,
r
=
20
c
m
,
l
=
29
c
m
.
We know, slant height
l
2
=
r
2
+
h
2
.
So,
h
2
=
(
29
)
2
−
(
20
)
2
h
2
=
841
−
400
=
441
h
=
21
c
m
.
We know that the volume of the cone
=
1
3
π
r
2
h
=
1
3
×
22
7
×
20
2
×
21
=
8800
c
m
3
.
Hence, option
A
is correct.
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