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Pf= Pk - Pt (Pk - pole kwadratu, Pt pole trójkata)
Pk = a²
Pt = (a-60)*(a-60)/2
Pf= a² - [(a-60)(a-60)]/2
Pf= [2a²- a²+120a-3600]/2
Pf=(a²+120a-3600)/2