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a container open at the top and made up of a metal sheet, is in the form of a frustum of a cone of height 14 cm with radii of its lower and upper circular ends as 6 cm and 21 cm, respectively. find the capacity of the container.

Text Solution

Verified by Experts

Given,
`r1=8cm, r2=20cm, h=16cm`
Volume of container=`1/3pi(r1^2 + r2^2 +(r1)(r2))h`
=`22/7*(1/3)*(8^2+20^2 +20*8)*16 cm^3`
=`(22*208*16/7) cm^3`
=`(22*208*16/(7*1000))litres`
Cost of milk=`(22*208216/7)*20= Rs 28.16`
Total Surface area= `pi(r1+r2)l + pi(r1)^2`
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