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a=48cm
b=14 cm
s =20szt.
c=?
c^2=a^2+b^2
c^2=48^2+14^2
c^2=2304+196
c^2=2500
c=50 cm
c*s=50 cm*20szt.=1000 cm=10m
Odp.Poręcz ma długość 10 m.