NCERT class 9 maths chapter 13 Surface Areas and Volumes
Question 1:Find the surface area of a sphere of radius: (i) 10.5 cm (ii) 5.6 cm (iii) 14 cm
Exercise 13.4 maths class 9 Chapter 13 Surface Areas and Volumes
Question 2:Find the surface area of a sphere of diameter: (i) 14 cm (ii) 21 cm (iii) 3.5 m
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Question 3:Find the total surface area of a hemisphere of radius 10 cm. (Use π = 3.14)
class 9 maths solutions Surface Areas and Volumes
Question 4:The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases.
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Question 5:A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of tin-plating it on the inside at the rate of ` 16 per 100 cm2.
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Question 6:Find the radius of a sphere whose surface area is 154 cm2.
class 9 Maths NCERT Solutions Chapter 13 Surface Areas and Volumes Exercise 13.4
Question 7:The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas.
Exercise 13.4 class 9 Math ncert solutions Chapter 13
Question 8:A hemispherical bowl is made of steel, 0.25 cm thick. The inner radius of the bowl is 5 cm. Find the outer curved surface area of the bowl.
Question 9: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).