A container made of a metal sheet is in the form of a frustum of a cone of height 12 cm with radii of lower and upper ends 3 cm and 12 cm, respectively. Find the cost of the metal sheet used, if it costs ₹7 per 100 cm?
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Step-by-step explanation:
this is simple question based on the concept of frustum and ... area of frustum will be useful here
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