Mensuration Practice Test 1

Question : 4 of 40

Marks: +1, -0

If the ratio of the diameters of two spheres is 3 : 5, then what is the ratio of their surface areas?

Solution:

Ratio of the diameter of two spheres = 3 : 5
Ratio of the surface areas of the sphere
=

4πR^2 : 4πr^2

4π(3/2)^2 : 4π(5/2)^2

4 . 9/4 : 4 . {25}/4

= 9 : 25

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