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Triangles
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Demonstrations 301  320 of 464
The Square of a Median in Terms of the Triangle's Sides
Bisection of Segments by the Sides of a Triangle
The Sum of the Squares of the Distances from the Vertices to the Orthocenter
The Orthocenter of the Medial Triangle
Four Collinear Points Related to the Altitudes
Lester's Theorem
The Circumcircle of the Orthocenter and Two Vertices and a Parallelogram
Equilateral Triangle to Square
The Area of the Excentral Triangle
The Product of the Distances of the Incenter to the Vertices
The Second Lemoine Circle
Feuerbach's Theorem
The Center and Radius of the NinePoint Circle
The Distance to the Orthocenter
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
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