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x - 2 bok
72cm - obwód
2(3x+x)=72cm
2*4x=72cm
8x=72cm | /8
x=9cm
3x=9cm*3
3x=27cm
9cm*27cm=243cm2
b1 = x
b2 = 3x
72 = 2(3x) + 2x
72 = 6x + 2x
72 = 8x/ :8
9 = x
3x = 3•9
3x = 27
P = 9•27
P = 243
bok a - x
bok b - 3x
obwód - 72cm
O=2a+2b
O=2x+2*3x
O=8x
8x=72cm
x=9cm
bok a - x=9cm
bok b - 3x=27cm
P=a*b=9cm*27cm=243cm²
Odp.: Pole tego prostokąta wynosi 243cm².