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Geometry
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Demonstrations 2321  2340 of 3037
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
The Ulam Prime Spiral
Line Segments through the Vertices and the Circumcenter of an Acute Triangle
Circles through the Orthocenter
Concyclic Points Related to a Midpoint and the Incircle
An Altitude and Four Concyclic Points
Products of Segments of Altitudes
Perpendicular Lines Generated by a Quadrilateral
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