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Standard IX
Mathematics
Curved surface area of a Right Circular cone
Question
Find
the radius of the base of
a cone having a slant height of
8
and a lateral area of
48
π
.
3
6
12
16
2
A
6
B
16
C
3
D
12
E
2
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Solution
Verified by Toppr
Given, slant height
l
=
8
and lateral/curved surface area
=
48
π
.
Lateral area of cone is
π
r
l
=
48
π
⇒
r
l
=
48
⇒
8
r
=
48
⇒
r
=
48
8
=
6
.
Therefore, option
B
is correct.
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