1.

It the curved surface area of a sphere is 154 cm, find the total surface area .​

Answer»

Surface area of a sphere=4πr 2 =154CM 2 ⇒4× 722 R 2 =154cm 2 ⇒r 2 = 4154 × 227 ⇒r 2 = 449 ⇒r= 449 ∴r= 27 =3.5cmVolume of the sphere= 34 πr 3 = 34 × 722 ×(3.5) 3 = 2188 ×42.875‬=179.67cm 3


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