Q. 184.3( 13 Votes )

Answer :

Given: let the height of the cone be H and its base radius be R

This cone is divided into two parts through the mid-point of the height of the cone such that

ED||BC

Therefore triangle AED is similar to triangle ABC

By the condition of similarity,

Volume of a cone = 1/3 πr^{2}h

Volume of the frustum = Volume of the cone ABC – Volume of the cone AED

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PREVIOUSA milk container is made of metal sheet in the shape of frustum of a cone whose volume is . The radii of its lower and upper circular ends are 8 cm and 20 cm respectively. Find the cost of metal sheet used in making the container at the rate of Rs. 1.40 per .NEXTA bucket open at the top and made up of a metal sheet is in the form of a frustum of a cone. The depth of the bucket is 24 cm and the diameters of its upper and lower circular ends are 30 cm and 10 cm respectively. Find the cost of metal sheet used in it at the rate of Rs. 10 per 100 .

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