40cm*50cm=2000cm^2
40cm*60cm=2400cm^2 * 2=4800cm^2
50cm*60cm=3000cm^2 * 2=6000cm^2
2000cm^2+4800cm^2+6000cm^2=12800cm^2
cm^2-cm kwadratowy
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40cm*50cm=2000cm^2
40cm*60cm=2400cm^2 * 2=4800cm^2
50cm*60cm=3000cm^2 * 2=6000cm^2
2000cm^2+4800cm^2+6000cm^2=12800cm^2
cm^2-cm kwadratowy