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P -pole kwadratu = 1² = 1
P₁ -pole trójkąta AED = 1/3 * 1 : 2 = 1/3 * 1/2 = 1/6
P₂ - pole trójkąta ABF = 1/3 * 1 : 2 = 1/3 * 1/2 = 1/6
Pf - pole figury zakreskowanej = P - (P₁+ P₂) = 1 - (1/6 + 1/6) =
= 1 - 2/6 = 6/6 - 2/6 = 4/6 = 2/3