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Standard IX
Mathematics
Curved surface area of a Right Circular cone
Question
Calculate the surface area of cone whose curved surface area is
100
c
m
2
and its radius
200
cm.
125700
m
m
2
125700
c
m
125700
m
2
125700
c
m
2
A
125700
c
m
B
125700
c
m
2
C
125700
m
2
D
125700
m
m
2
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Solution
Verified by Toppr
Given, radius
r
=
200
c
m
and curved surface area of the cone
=
100
c
m
2
.
We know, surface area of a cone
=
Curved surface area of a cone
+
Area of circle.
=
π
r
s
+
π
r
2
=
100
+
3.14
×
200
×
200
=
100
+
125600
=
125700
c
m
2
.
Therefore, option
D
is correct.
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