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Plane Geometry
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Demonstrations 861  880 of 1107
Tangent Points on a Semicircle
Area of a Triangle inside the Incircle
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
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