Calculate the surface area of a sphere of radius $2.8$ cm.
$98.56$ cm $^{2}$
$68.56$ cm $^{2}$
$38.56$ cm $^{2}$
None of these

Question

Calculate the surface area of a sphere of radius 2-8 cm-98-56 cm-268-56 cm-238-56 cm-2None of these

Toppr Admin · Accepted Answer

Given- radius r-2-8 cm-We know that- the surface area of a sphere of radius r -4-x3C0-r2-4-xD7-227-xD7-2-8-xD7-2-8-98-56cm2-Therefore- option A is-correct-

Calculate the surface area of a sphere of radius 2.8 cm.98.56 cm268.56 cm238.56 cm2None of these

Given, radius r=2.8 cm. We know that, the surface area of a sphere of radius r =4πr2 =4×227×2.8×2.8 =98.56cm2. Therefore, option A is correct.

Calculate the surface area of a sphere of radius $2.8$ cm.
$98.56$ cm $^{2}$
$68.56$ cm $^{2}$
$38.56$ cm $^{2}$
None of these

Given, radius $r = 2.8$ cm.

We know that, the surface area of a sphere of radius $r$ $= 4 π r^{2}$

$= 4 \times \frac{22}{7} \times 2.8 \times 2.8$

$= 98.56 {c m}^{2}$ .
Therefore, option $A$ is correct.