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1: 10 000
1cm - 100m
1cm² - 10 000m²
x - 18 000m²
x / 18 000 = 1/10 000
x / 18 = 1/10
x = 1,8 cm²
Zad.2
1 cm -> 1 000 cm
1cm -> 10m
1cm² -> 100m²
20cm² -> x
20/x = 1/100
x=2000m² = 20a