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1 cm = 100 m
1 cm = 0,1 km
0,42kmx2+0,25kmx2 = 1,34 km
Odp.:Rzeczywisty obwód działki wynosi 1,34 km.
4,2 cm - x
x=(4,2×10000)÷1
x= 42000 cm = 420 m = 0,42 km
1 cm - 10000
2,5cm - y
y= 2,5×10000
y= 25000 cm = 250 m = 0,25 km
Obw= 2×420m+2×250m
Obw= 1340m
4,2cm-x
100m*4,2cm/1cm =420m
1cm-100m
2,5cm-x
100m*2,5cm/1cm=250m
ob=2*250m+2*420m
ob=500+840
ob=1340