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63000000:2000000=31,5[cm]
1cm na mapie to 300 km w terenie
2,1 x 300 = 630 km
630km Ma jezioro w skali pierwszej
skala 1:2000000
1cm na mapie to 20 km w terenie
630 : 20= 31,5 cm
Jezioro ma długość 31,5 cm na mapie
1cm - 20km
300 x 2,1 = 630
630 : 20 = 31,5