Poliagapitos – Resources – GeoGebra

One property of tangential quadrilaterals
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Constant product of the lengths of two line segments
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Geometrium
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Six conelliptic points
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Principal diagonals of octagon meet in a single point
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Five pairs of similar triangles
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Four pairs of similar triangles
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Three pairs of similar triangles
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Equal products of triangle areas
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Concyclic circumcenters
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Eight circumcenters lie on a circle
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Six circumcenters lie on a circle
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Five circumcenters lie on a circle
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Collinearity in tangential pentagon
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Equal sums of line segments
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Isosceles triangle and excircle
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Characterizations of cyclic quadrilaterals
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Collinearity in bicentric pentagon II
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Collinearity in bicentric hexagon
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Collinearity in bicentric quadrilateral
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Collinearity in bicentric octagon
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Collinearity in bicentric heptagon
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Points of concurrency of the lines defined by triangle centers and vertices
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Ratio of area of triangle and hexagon II
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Poliagapitos