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Plane Geometry
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Demonstrations 861  880 of 1206
Normal Lines to a Parabola
The Second Lemoine Circle
Feuerbach's Theorem
The Center and Radius of the NinePoint Circle
Classifying Quadrilaterals
The Distance to the Orthocenter
Rectangles: Perimeter and Area
Similar Triangles Determined by Miquel Circles and the Circumcircle
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
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
The Third Pedal Triangle of a Triangle
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