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Standard IX
Mathematics
RS Agarwal
Question
Find the total surface area of a cone, if its slant height is
21
m and diameter of its base is
24
m.
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Solution
Verified by Toppr
Given:
R
=
24
2
=
12
m, Slant height
=
21
m
⇒
Total Surface area of cone
=
π
r
(
r
+
l
)
=
22
7
×
12
(
12
+
21
)
m
2
=
22
7
×
12
×
33
m
2
=
1244.57
m
2
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