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Obw = 52cm
52-30=22 (zdjęcie 0457)
P= (a+b)×h/2
P= (10+32)×10/2
P= 42×10/2
P=420/2
P=210cm²
zad3.
54-36=18
18:2=9
(zdjęcie 0459)
41²-9²=x²
1681-81=x²
x²=1600
x=40