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bok x
bok y
y=x-4
ob-obwod
ob=2x+2y
ob=2x+2(x-4)
ob=2x+2x-8
ob=16
16=4x-8
24=4x
x=6
y=x-4
y=2
x+4-dł drugiego boku prostokąta
x+x+4=16
2x+4=16
2x=16-4
2x=12 /2
x=6
x+4=6+4=10
Pp = a*b
Pp = 6*10
Pp = 60 cm2
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