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Standard IX
Mathematics
Question
If the radius of the base of a right circular cone is
2
c
m
and its slant height is
3.5
c
m
, then its curved surface area is:
44
c
m
2
77
c
m
2
22
c
m
2
154
c
m
2
A
77
c
m
2
B
154
c
m
2
C
22
c
m
2
D
44
c
m
2
Open in App
Solution
Verified by Toppr
Given the radius of the base of a right circular cone
(
r
)
=
2
cm, and its slant height
(
l
)
=
3.5
cm.
Then, its curved surface area
=
π
r
l
=
22
7
×
2
×
3.5
=
22
cm
2
.
Therefore, option
C
is correct.
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