A container,open at the top, made of metal sheet,is in the form of a frustum of a cone of height 24cm with radii of its lower upper ends as 7cm 14cm respectively.Find the cost of milk which can completely fill the container at the rate of rs.25 per liter.Also find the of the metal sheet used to make the container.
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Umm Shivammu,
you forgot to add the base area as well.
πl(r1+r2)+πr2
=22/7x25x21+154
=1650+154
=1804 cm2
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