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b- przyprostokątna
c- przeciwprostokątna
c=2+8
c=10
a2+b2=c2 <= a2 i b2 to a i b do potegi drugiej
a2+b2=100 bo c2=100 <= 10 do potęgi drugiej wynosi 100
a+b=10 , c=10
Obw=a+b+c
Obw= 20