Question

Find the surface area and volume of sphere of a diameter21cm

Answer 1

Answer:

area is 1386cm2

volume is 4851cm3

Step-by-step explanation:

Diameter of sphere = 21 cm.

∴ Radius of sphere = 21/2 cm.

∴ Surface area of sphere = 4πr2

= 4 × 22/7 × 21/2 × 21/2.

= 1386 cm2

Volume of sphere = 4/3πr3

= 4/3 × 22/7 × 21/2 × 21/2 × 21/2.

= 4851 cm3

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