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Standard IX
Mathematics
Curved surface area of a Right Circular cone
Question
If the diameter of a right cone is
6
c
m
and its vertical height is
4
c
m
, then its curved surface area is:
47.1
c
m
2
48
c
m
2
49
c
m
2
50
c
m
2
A
47.1
c
m
2
B
49
c
m
2
C
50
c
m
2
D
48
c
m
2
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Solution
Verified by Toppr
The correct option is
A
47.1
c
m
2
Given, the vertical height is
h
=
4
c
m
and diameter is
d
=
6
c
m
.
Then, radius
=
d
2
=
6
2
=
3
c
m
.
Now, slant height =
l
=
√
r
2
+
h
2
=
√
(
3
)
2
+
(
4
)
2
=
√
9
+
16
=
√
25
=
5
c
m
.
Then, the curved surface area of a right circular cone
=
π
r
L
=
π
×
3
×
5
=
3.14
×
5
×
3
=
47.1
c
m
2
.
Hence, option
A
is correct.
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