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OpenStudy (anonymous):
the surface area of a plastic ball is 196pi a sponge ball has a radius twice that of the plastic ball. what is the surface area of the sponge ball?
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OpenStudy (anonymous):
we know area is 4pir^2
OpenStudy (anonymous):
So we would just square the ratio (2)^2=4
OpenStudy (anonymous):
radius twice =>surface area 4 time more..
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