Find the volume of a sphere if itd surface area is 154 sq .cm.
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Surface area of a sphere=4πr2=154cm2
⇒4×722r2=154cm2
⇒r2=4154×227
⇒r2=449
⇒r=449
∴r=27=3.5cm
Volume of the sphere=34πr3
=34×722×(3.5)3
=2188×42.875=179.67cm3
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