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Plane Geometry
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Demonstrations 861  880 of 1102
Cofunction Identities for Sine and Cosine
Incircles and a Cevian
The Midpoints of Two Cevians
The Quadrilateral of Centroids
The Area of the Contact Triangle
Perpendiculars to a Chord
The Minkowski Sum of Two Triangles
Theorem of the Owl's Eyes
Napoleon's Theorem
Area of a Parallelogram
Fagnano's Problem
Bankoff Circle
Ptolemy's Theorem
Euclid's Proof of the Pythagorean Theorem
Miquel's Pentagram Theorem
Covering the Plane with Polygons
Simson's Theorem
Johnson's Theorem
FiveSquarestoOne Dissection
The Perpendicular Bisector of a Chord
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