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2r=40dm
r=40:2
r=20dm
pole=4πr²=4π×20²=1600πdm²= pole kuli
l=40πdm r=?
l=2πr
P=?
2πr=40πdm:2
2r=40dm
r=40dm:2
r=20dm
P=πr[do kwadratu]
P=π*20dm[do kwadratu]
P=400πdm[kwadratowych]