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P=a²
P=(30m)²=900m²
P. scieżki=30m*0,5m+29,5m*0,5m+29,5m*1,5m+28m*1,5m=15m²+14,75m²+44,25m²+42m²=116m²
Odp :Ścieżka zajmuje 116/900=około 0,129=12,9% działki