Question

A container is shaped like frustum of a cone of height 8cm with radii of its lower and upper ends as 4cm and 10cm,respectively.find the cost of the milk which can completely fill the container at the rate of Rs 20 per litre.
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Answer 1

Answer:

Vol of frustum = 1/3πh(R^2+r^2+Rr)

= 1/3×3.14×8×(10^2+4^2+10×4)

= 1/3×3.14×8×156

= 1306.24 cm^3

Cost of milk = 20 × 1306.24/1000 litres

= ₹ 26.1248

Hope it will help u !!

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