ML Aggarwal Solutions Class 10 Mathematics Solutions for Mensuration Exercise 17.3 in Chapter 17 - Mensuration

Question 13 Mensuration Exercise 17.3

If the ratio of the radii of two sphere is 3 : 7.

Find : the ratio of their surface areas.



The curved surface area of a sphere equals the sphere's entire area because the sphere is completely curved.

Surface area of a sphere = 4π r2

Ratio of surface areas of two spheres =

4π r12/4π r22

= r12/r22

= 32/72

= 9/49

Hence the ratio of the surface areas is 9:49. M L Aggarwal - Understanding ICSE Mathematics - Class 10 chapter Mensuration Question 13 Solution image

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