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p= 4x 22/7 x 7 (do kwadratu)
p= 4x 22/7 x 49
p=616
π=22/7
P=4πr²
P=4*(22/7) *7²
P=88/7 *49
P=4312/7
P=616cm²
osp: pole powierzchni kuli wynosi 616cm²