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A toy company makes rubber balls with a diameter of 20cm. How much rubber would be saved per ball if the balls had a diameter of 15cm?

 Jun 3, 2021
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diameter  of  20  =   radius of 10

diameter of  15  =   radius  of  7.5

 

To  find the  savings.......take  the  difference in surface areas  =

 

4pi   ( 10^2  - 7.5^2)  =

 

4pi  ( 100  - 56.25)  =

 

4 pi  * 43.75  cm^2     =   

 

 175 pi   cm^2

 

cool cool cool

 Jun 3, 2021

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