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NCERT Solutions Class 9 Mathematics Solutions for Surface Areas and Volumes - Exercise 13.4 in Chapter 13 - Surface Areas and Volumes

Question 5 Surface Areas and Volumes - Exercise 13.4

A hemispherical bowl made of brass has an inner diameter of 10.5 cm. Find the cost of tin-plating it

on the inside at the rate of Rs 16 per 100 \mathrm{cm}^{2} . \text { (Assume } \left.\pi=22 / 7\right)

Answer:

Inner radius of hemispherical bowl, say r = diameter/2 = (10.5)/2 cm = 5.25 cm

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