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Standard IX
Mathematics
Curved surface area of a Right Circular cone
Question
The slant side of a right circular cone is
10
m and its height is
8
m. Find the area of its curved surface
(
π
=
31.4
)
.
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Solution
Verified by Toppr
l
=
10
m
,
h
=
8
m
∴
r
=
√
l
2
−
h
2
=
6
m
∴
Curved surface area
=
π
r
l
3.114
×
6
×
10
=
188.4
m
2
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