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5:x
x=250 000cm=2500 m= 2,5 km
1:50 000
3:y
y=150 000cm= 1,5 km
P=1,5*2,5
P=3,75 km²
1cm - 500 m
1cm - 0,5 km
5 cm * 3 cm = 5*(0,5)*3*(0,5)=2,5*1,5=3,75 km²