MathematicsWhich of following is the surface area of a sphere of radius 4.2cm? [π=227]

Which of following is the surface area of a sphere of radius $4.2$ cm? $[π = \frac{22}{7}]$

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A
$201.76 {cm}^{2}$
B
$211.76 {cm}^{2}$
C
$221.76 {cm}^{2}$
D
$321.76 {cm}^{2}$

Solution:

Given,
Radius of sphere

= 4.2

cm.
Surface area of a sphere of radius '

r

= 4 π r^{2}

S . A = 4 \times \frac{22}{7} \times 4.2 \times 4.2

S . A = 221.76 {cm}^{2}

Hence, the surface area of a sphere is

221.76 {cm}^{2}

.
Therefore, option 3 is correct.

Which of following is the surface area of a sphere of radius $4.2$ cm? $[π = \frac{22}{7}]$

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