1.

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

Answer»

\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{<klux>GIVEN</klux> : }} \\ : \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}}


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