Mensuration Practice Test 2

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Question : 15 of 40

Marks: +1, -0

If the volume of a sphere is divided by its surface area, we obtain 27 cm. The radius of the sphere is:

9 cm
81 cm
27 cm
24 cm

Solution:

{\Volume \of \sphere}/{\Surface \area \of \sphere}

= 27 cm

{4/3 πr^3}/{4πr^2}

= 27

4/3 × 1/4 × r

= 27

1/3 r

= 27
r = 81 cm.

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