Which of the following is the surface area of a sphere of radius 2.8cm?

Which of the following is the surface area of a sphere of radius $2.8$ cm?

A
$98.56$ ${cm}^{2}$
B
$68.56 {cm}^{2}$
C
$38.56$ ${cm}^{2}$
D
None of these

Solution:

Given,
Radius

r = 2.8

cm.
The surface area of a sphere of radius

r = 4 π r^{2}

.

S . A = 4 \times \frac{22}{7} \times 2.8 \times 2.8

S . A = 98.56 {cm}^{2}

Hence, the surface area of sphere is

98.56 {cm}^{2}

.
Therefore, option 1 is correct.

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