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400πcm²=πr²/:π
r²=400
r=√400
r=20cm
średnica koła=2r=2×20cm=40cm
πr²=400π
r²=400
r=20
średnica=2*r
śr=40cm.
P=Πr²
P=π(d/2)²
P=πd²/4
4P=πd²
d²=4P/π
d=√4P/π
d=√4*400π/π
d=2*20
d=40cm