Question

a hemisphere base font has inner diameter 105 em. Find the cost of tin-plating it
on the inside at the rate of 16 per 100 cm^2
​

Answer 1

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 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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