Odpowiedź:
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zad5.
P, F
zad6
obw= 2×5 + 2×8 = 10+16 =26 cm
P = 5×8 = 40 cm2
zad 7
P= 36 cm2
P = a×a
36 = a^2
a = 6 cm
obw = 4× a
obw = 4×6 = 24 cm
