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Standard XII
Mathematics
Question
A sphere is inscribed in a cone of radius
3
√
3
and slant height
6
√
3
. The radius of the sphere, is -
3
3
√
3
6
√
3
3
√
3
2
A
3
√
3
2
B
3
C
6
√
3
D
3
√
3
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Solution
Verified by Toppr
B
C
=
√
(
6
√
3
)
2
−
(
3
√
3
)
2
=
√
108
−
27
=
9
B
O
=
9
−
R
,
A
O
=
O
B
√
r
2
+
(
3
√
3
)
2
=
9
−
r
r
2
+
27
=
81
+
r
2
−
18
r
18
r
=
54
⇒
r
=
3
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