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Geometry
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Demonstrations 2401  2420 of 3124
Normal Lines to a Parabola
Albrecht Dürer's Pentagon of 1525
Simple ThreeLetter Cube
The Second Lemoine Circle
Moving the Vertices of the Great Rhombicuboctahedron
Conic Sections: The Double Cone
Liquids in Containers of Different Shape
Feuerbach's Theorem
The Center and Radius of the NinePoint Circle
Classifying Quadrilaterals
The Distance to the Orthocenter
2D View of a Conformal Mapping
Rectangles: Perimeter and Area
Similar Triangles Determined by Miquel Circles and the Circumcircle
Dihedral Group n of Order 2n
Parabolic Envelope from Congruent Triangles
The Incircle and the Altitudes of a Triangle
Circumradii Perpendicular to the Sides of the Orthic Triangle
Perpendiculars from the Midpoints of the Orthic Triangle
Collinear Orthocenters
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