Question :-
The students of a Vidyalaya were asked to participate in a competition for making and
decorating penholders in the shape of a cylinder with a base, using cardboard. Each
penholder was to be of radius 3 cm and height 10,5 cm. The Vidyalaya was to supply
the competitors with cardboard. If there were 35 competitors, how much cardboard was required to be bought for the competition?
Note :-
Explained answers needed.
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Answers
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Answer:
R=3cm, H=10.5cm
⇒Surface area = Curved Surface Area + Base Area
=2πrh+πr
2
=2×
7
22
×3×
10
10.5
+
7
22
×3×3cm
2
=198+
7
198
cm
2
=
7
1584
cm
2
⇒Area of cardboard sheet used by competitor =
7
1584
cm
2
⇒Area of cardboard sheet used by 35 competitors =
7
1584
×35
=7920cm
2
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