Question 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?
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Step-by-step explanation:
- So here they mentioned penholder in shape of cylinder with one-side close and other side open
- So total surface area of cylinder is equal to 2πrh + 2πr2
- we have to neglect one πr2 as they said one side is open
- Area required for one penholder is 2πrh + πr2
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