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Area = Side2 = 20*20 cm2 = 400 cm2
If the diameter of a circle 20 cm is tripled the area will increase from 314.2 cm2 to 2,827 cm2
20 cm x 20 cm = 400 cm2
500 cm2
I regret that I have no idea how a box can have a volume of 20 cm2 since that is not a unit which can be used to measure volume.