Mensuration Practice Test 5

Question : 28 of 40

Marks: +1, -0

The number of square centimeters of the surface of the sphere is numerically equal to the number of cubic centimeters of the volume. The radius of the sphere in centimeters is ______ .

$3/4$
3
12
1

Validate

Solution:

Area of the sphere =

4πr^2

cm
Volume of the sphere =

{4πr^2}/3 cm^3

According to the statement,
=

4πr^2

4/3 πr^3

r^2

1/3 r^2

1 =

r/3

r = 3 cm.

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