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Obw = 2a+2b
krótszy bok - x
dłuższy bok - 3,5x
2*(x+3,5x) = 108
2*4,5x = 108
9x = 108 /:9
x = 12 cm
12*3,5 = 42 cm
P = a*b
P = 12*42
P = 504 cm²