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y - dlugosc dluzszego boku
obw = 108
2x + 2y = 108
y= 3,5x
2x + 2*(3,5x) = 108
2x + 7x = 108
9x = 108
x = 12
y = 12* 3,5 = 42
P = ½* 12 * 42 = 252
Odp: Pole wynosi 252cm²
y-krótszy bok
x=3,5*y
obwód=
2x+2y=108cm
2*3,5y+2y=108cm
7y+2y=108cm
9y=108cm/:9
y=12cm-krótszy bok
x=3,5y
x=12cm*3,5
x=42cm-dłuższy bok
pole=
P=a*b
a=42cm
b=12cm
P=42cm*12cm
P=504cm²
odp.pole prostokąta wynosi 504cm²