What is the total surface area of a sphere? (let r is the radius of sphere)

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4 π r^{2}

2 π r^{2}

\frac{4}{3} π r^{2}

3 π r^{2}

answer is A.

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Detailed Solution

Total surface area of the sphere is the area which is occupied by the curved surface of this figure.
The total Surface area of sphere can be given as,

TSA = 4 \times π {(radius)}^{2}

Given radius of the sphere = r
Thus,

TSA = 4 π r^{2}

So, the total surface area of a sphere is

4 π r^{2} .

Correct option is 1.

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