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b=8-4=4
c=?
twierdzenie pitagorasa= akwadrat+bkwadrat=ckwadrat
czyli
ckwadrat=64+16=80
c=4pierwiastki z pieciu
obw=a+b+c
obw=8+4+4pierwiastki z pieciu= 12 + 4pierwiastki z pieciu