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P=pir2
pi - 3,14
r - promień, wynosi 1mm
2 - do kwadratu ;)
P=314mm*1mm2 = 314mm3
I teraz razy wysokość
314mm3*160mm=50240mm3=50,240cm3
50,240cm3*2,3g =115,552g - tyle waży ten rysik