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Obw. = 2x + 2y
x=7
26=2x+2y
26=14+2y / -14
12=2y
y = 6cm
Teraz wystarczy tylko narysować
a-jeden bok
b-drugi bok
a=7
l=2a+2b
26=2*7+2b
26=14+2b/-14
12=2b/:2
6=b