Q : 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 and height . 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?
Given, a cylinder with a base.
The radius of the cylinder =
Height of the cylinder =
The lateral surface area of a cylinder of radius and height =
Area of the cylindrical penholder = Lateral areal + Base area
Area of 35 penholders =
Therefore, the area of carboard required is