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UPSC 2013 CDS 2 Math Paper
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© examsnet.com
Question : 59
Total: 100
What is the whole surface area of a cone of base radius 7 cm and height 24 cm?
[2013 CDS-II]
654 square cm
704 square cm
724 square cm
964 square cm
Validate
Solution:
Radius of the cone = r = 7 cm
Height of the cone = h = 24 cm
Slant height of the cone
=
I
=
√
r
2
+
h
2
=
√
7
2
+
24
2
=
25
c
m
Therefore, whole surface area of the cone
=
π
r
(
r
+
1
)
=
22
7
×
7
×
(
7
+
25
)
=
704
cm
2
© examsnet.com
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