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Q.

The surface area of a sphere of radius " r "is given by

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a

$2 π r^{2}$

b

$π r^{2}$

c

$4 π r^{2}$

d

$3 π r^{2}$

answer is B.

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Detailed Solution

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Concept: The surface area of a sphere has been defined as the total area covered by its outer surface.

Hence, the sphere of radius " r " has a surface area $4 π r^{2}$ .

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The surface area of a sphere of radius " r "is given by