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P=a*h/2
54cm²=a*6cm/2 /*2
108cm²=6a cm/6cm
a=18cm
zadanie 2
P=a*h/2
28cm²=5,6cm*h/2 /*2
56cm²=5,6cmh/5,6cm
10cm=h
zad.2 odpowiedź 2,8cm