A spherical ball bearing will be coated by 0.07cm of protective coating. If the radius of this ball bearing is 7 cm, approximately how much coating will be required?
I know how to find the answer. I'm just confused on why you would use the volume of sphere instead of surface area when using differential approximation...
43.080 cm3 is the approximate coating required .
We use volume of the sphere instead of surface area because volume is the Integral of surface area . So it's make it easy to solve the problem .
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