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Plane Geometry
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Demonstrations 961  980 of 1195
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
Stengel's Theorem
Pedal Triangles of Isogonal Conjugates
Hinged and Translational Dissection of Two Squares to One
Circular Coverings
The Carpets Theorem
The Midpoint Quadrilateral Theorem
The Two Triangles Theorem
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