Question

find the curved surface area of a solid sphere whose radius is 7 cm​

Answer 1

csa of cone =

$4\pi \: r { }^{2} \\ = 4 \times 22 \div 7 \times 49 \\ = 4 \times 22 \times 7 \\ = 616 cm square$

Answer 2

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

$\green{\therefore{\text{T.S.A\:of\:sphere=616\:cm}^{2}}}$

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

$\green{ \underline \bold{Given : }} \\ : \implies \text{Radius(r) = 7\: cm} \\ \\ \red{ \underline \bold{To \: Find : }} \\:\implies \text{T.S.A\: of \: sphere= ? }$

• According to given question :

$\bold{As \: we \: know \: that} \\ : \implies \text{T.S.A\: of \: sphere} =4\pi r^{2} \\ \\ : \implies \text{T.S.A\: of \: sphere} =4 \times \frac{22}{7} \times (7)^{2} \\ \\ : \implies \text{T.S.A\: of \: sphere} =4 \times 22\times 7 \\ \\ \green{ : \implies \text{T.S.A\: of \: sphere} = 616\: {cm}^{2}}\\\\ \purple{\text{Some\:formula\:related\:to\:this\:topic}}\\ \pink{\circ\:\text{Volume\:of\:sphere}=\frac{4}{3}\pi r^{3}}$