Question

Find the C.S.A of the sphere whose sradius is 21 on?​

Answer 1

CSA = 4×22/7×r^2

=4× 22/7× 21× 21

=4× 22× 21× 3

=462×12

=5544 cm^2

Answer 2

$\blue{\bold{\underline{\underline{Answer:}}}}$

$\green{\therefore{\text{C.S.A\:of\:sphere=5544\:cm}^{2}}}$

$\orange{\bold{\underline{\underline{Step-by-step\:explanation:}}}}$

$\green{ \underline \bold{Given : }} \\ : \implies \text{Radius(r)=21\:cm}\\ \\ \red{ \underline \bold{To \: Find : }} \\:\implies \text{C.S.A\: of \: sphere= ? }$

• According to given question :

$\bold{As \: we \: know \: that} \\ : \implies \text{C.S.A\: of \: sphere} =4\pi r^{2} \\ \\ : \implies \text{C.S.A\: of \: sphere} =4 \times \frac{22}{7} \times (21)^{2} \\ \\ : \implies \text{C.S.A\: of \: sphere} =4 \times 22\times 63\\ \\ \green{ : \implies \text{C.S.A\: of \: sphere} =5544\: {cm}^{2}}\\\\ \purple{\text{Some\:formula\:related\:to\:this\:topic}}\\ \pink{\circ\:\text{Volume\:of\:sphere}=\frac{4}{3}\pi r^{3}}$