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240:4 = 60 stopni
b) 45 min : 4 min= 11,25 stopnia
a) po czterech godzinach- 1 godzina = 60 min, 60 min × 4 = 240 min, a teraz 240 ÷ 4°= 60°
b) po 45 min- 45 ÷ 4 = 11,25°