11. 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?
Answers
Answered by
1
Answer:
Given:
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
Answered by
0
Answer:
Answer
Given:
R=3cm, H=10.5cm
⇒Surface area = Curved Surface Area + Base Area
=2πrh+πr2
=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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