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Cf aS atr is beingds ot the balloon in the two cases.ical bowl made of brass has inner diameter 10.5 cm. Findit on the inside at the rate of 16 per 100 cmhe radius of a sphere wh |
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Answer» Here we will tin-plate the inside of the hemisphere So, We need to find the curved surface area of hemisphere Radius of hemisphere = r = /2 = (10.5/2) cm = 5.25 cm Curved surface area of the hemisphere = 22 = (2×22/7×5.25×5.25) cm2 = 173.25 cm2 Cost of tin-plating 100 cm2 = Rs 16Cost of tin-plating 1 cm2 = Rs 1/100 × 16Cost of tin-plating 173.25 cm2 = Rs 1/100 × 16 × 173.25 = Rs 27.72∴ Cost of tin-plating the hemisphere is Rs 27.72 |
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