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6ar=600m2
12m*15m=180m2
600m2 - 100%
180m2 - x%
x=30%
lub
180/600=9/30=3/10
b-12m
P=2*a+2*b
P=2*15+2*12=30+24=54m2
54m2-0,54a
6a-0,54a=5,46a
odp.dom zajmuje 0,54 a z tej działki.