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b - drugi bok
a=b+6
2a+2b=40
2(b+6)+2b=40
2b+12+2b=40
4b=40-12
4b=28
b=28/4
b=7cm
a=7+6=13cm
P=ab
P=7*13=91cm^2
y - drugi bok
x = y+6
2(y+6)+2y=40
2y+12+2y=40
4y=40-12
4b=28
y=28/4
y=7cm
x=7+6=13cm
P=xy
P=7*13=91cm^2