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a = 1,8dm * 250 = 18cm * 250 = 4 500cm = 45m
b = 8cm * 250 = 2 000cm = 20m
P = a x b
P = 45m * 20m
P = 900m^2 -------- pole działki
Ob = 2a + 2b
Ob = 2 * 45m + 2 * 20m
Ob = 90m + 40m
Ob = 130m ----------- tyle m siatki potrzeba