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180m=18000cm
w skali 1:900 obwód wynosi 18000/900=20cm
odp: obwód w skali 1:900 wynosi 20cm
L=2*30m+2*60m
L=60m+120m
L=180m
180m/900=0,2m
30m = 3000cm
60m = 6000cm
Ob = 2*3000 + 2*6000 = 6000+12000=18 000cm
w skali 1:900
18 000 : 900 = 20(cm)
Obwód lodowiska w skali 1:900 wynosi 20 cm