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A hemispherical bowl made of brass …

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A hemispherical bowl made of brass has inner diameter 10.5cm. Find the cost of tin-plating it on the inside at the rate of Rs.16 per 100cm

Posted by Swati Chauhan 4 years, 8 months ago

CBSE > Class 09 > Mathematics

1 answers

Sia ? 4 years, 7 months ago

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 16
Cost of tin-plating 1 cm2 = Rs 1/100 × 16
Cost 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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