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dłuższy bok - 2x
P = x*2x = 2x²
2x² = 450m² /:2
x² = 225m² /√
x = 15m
krótszy bok - 15m
dłuższy bok - 30m
Ob = 2*15m + 2*30m = 30m + 60m = 90m
na ogrodzenie boiska potrzeba 90 siatki