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IIbok----x+2
2x+2(x+2)=72
2x+2x+4=72
4x=72-4
4x=68/:4
x=17
Ibok=17cm
IIbok=19cm
spr:2*17+2*19=34+38=72
ob=72
a=x
b=x+2
ob=2a+2b
72=2x+2(x+2)
72-4=2x+2x
68=4x
x=68÷4
x=17
a=17
b=19
Bok B= A+2
2a+ 2b=2a+2(a+2)=72
2a+2a+4=72
4a=72-4
4a=68 /4
a=17
b= 17+2=19
spr: 2*17+ 2*19= 72