Parabola, focus, directrix and area of parabolic segment

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  1. Parabolic segment psABP is 4/3 area of polygon a=ABP. F - focus, p - parabola, d - directrix, b=ABF, c=ABCD, h - perpendicular of d, E - center of AB. psABP+b=(c-psABP)/2. https://en.wikipedi (.ggb)