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The diameter of a spherical ball is 21 cm. How much leather is required to prepare 5 such balls?

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The diameter of a spherical ball is 21 cm. How much leather is required to prepare 5 such balls?

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Diameter of the spherical ball d’ = 21 cm 

Thus, its radius r = d/2 = 21/2 = 10/5 cm

Surface area of one ball = 4πr2

= 4 × 22/7 x 10.5 x 10.5

= 88 × 1.5 × 10.5 = 1386 cm2

∴ Leather required for 5 such balls

= 5 × 1386 = 6930 cm2

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