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Plane Geometry
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Demonstrations 781  800 of 1025
Tangent Circles and Parallel Diameters
Adams' Circle and the Gergonne Point
Interior and Exterior Angles of Equilateral Figures
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
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