Ile cm2 wynosi na mapie ( skala= 1:20000000 cm.) powierzchnia wyspy, jeżeli jej rzeczywista powierzchnia wynosi 800 tys.km2
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1cm->200km
1cm2->40000km2
800 000km2:40 000km2=20cm2
1cm - 20000000cm
1cm - 200km
1cm² - (200km)²
1cm²-40000km²
x-800000km²
x=(800000km²*1cm²)/40000km² =20cm²