The student of a vidyalaya were asked to practice 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 3cm and height 10.5cm the vidyalaya was to supply the competition with cardboard if there were 35 competition how much cardboard was required to be bought for the competition
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cardboard used for making one penholder=■(pi)r×r+2■rh
=22/7×3×3+2×22/7×3×10.5
=226.28
:.cardboard required for 35 penholder=35×226.28
=7919.Sq.cm
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