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prostokąt I
b=70m
obw=120+140=260m
prostokąt II
a=219m
p=219m²
prostokąt III
a=8,5 km
obw=17+2=19km
zad 6
p=20x20=400m²
a) 1/5*400=80m²
b)1/8*400=50m²