## A right circular cylinder just encloses a sphere of radius r (see fig. 13.22). Find (i) surface area of the sphere, (ii) curved surface area of the cylinder, (iii) ratio of the areas obtained in(i) and (ii). Q.9

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## A hemispherical bowl is made of steel, 0.25 cm thick. The inner radius of the bowl is 5cm. Find the outer curved surface of the bowl. (Assume π =22/7) Q.8

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## The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas. Q.7

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## Find the radius of a sphere whose surface area is 154 cm2. (Assume π = 22/7) Q.6

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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 100 cm2. (Assume π = 22/7) Q.5

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## The radius of a spherical balloon increases from 7cm to 14cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases. Q.4

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## Find the total surface area of a hemisphere of radius 10 cm. [Use π=3.14] Q.3

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## Find the surface area of a sphere of diameter: (iii) 3.5cm Q.2(3)

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## Find the surface area of a sphere of diameter: (ii) 21cm Q.2(2)

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## Find the surface area of a sphere of diameter: (i) 14cm (Assume π = 22/7) Q.2(1)

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