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The material needed to make the skin of a basketball costs $71.62  / m2.  A standard basketball has a diameter of 24 cm.  To the nearest dollar, how much does a basketball cost to make?

 Jul 22, 2020
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The formula for the surface area of a sphere is:  Area  =  4·pi·r2.

 

If the basketball has a diameter of 24 cm, its radius is 12 cm.

 

Area  =  4·pi·r2   --->   Area  =  4·pi·122  =  1809.56 sq cm.

 

If the cost is  $71.62  per sq m, the cost, per square cm is  $71.62 / 1002  =   $ 0.007162.

 

Final cost:  $ 0.007162 x 1809.56  =  $12.96.

 Jul 22, 2020

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