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2.56cm
a=3cm
b=4cm
c=?
^ - do potegi
a^2 + b^2=c^2
3^2+4^2=c^2
9+16=c^2
25=c^2
c=5
zad2.
rab zawiera 4jednakowe trojkaty
d=6 i 8
3^2+4^2=x^2
x=5
obw= 4x= 5*4= 20cm