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12,56×¾=9,42(cm)-minutowa
2×1,5×π=3π=9,42(cm)
(9,42×45)/1440=0,29(cm)-godzinowa
45min to 3/4 obwodu π≈3,14
duza 3/4x2x3,14x2=9,42 cm
mała 3/4x2x3,14x1,5=7,065≈7,07cm