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1cm wynosi 300 km
W realu jezioro ma 2,1*300 = 630
1:2000000
1cm wynosi 20 km
Na tej mapie jeziorko ma 630/20 czyli 31,5 cm
1cm-30000000cm
1cm- 300km
2.1cm * 300km= 630km
1:2000000
1cm- 2000000 cm
1cm- 20km
x- 630km
1cm -20km
20x=630 /:20
x= 630:20
x=31,5
Lub
1:30000000
1cm-30000000cm
1cm- 300km
1:2000000
1cm- 2000000 cm
1cm- 20km
300:20= 15
15*2,1= 31,5