1.

The surface area of a football is 616 cm2, then find the radius of that ball. ( π = 22/7).

Answer»

Surface area of a football (sphere) = 4πr2

4πr2 = 616 

πr2 = 154 

r2 = 154 × \(\frac{7}{22}\)

r2 = 7 × 7 = 49 

∴ r = 7 cm



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