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Geometry
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Demonstrations 2401  2420 of 2973
Successive Averages of the Vertices of a Polygon
A Lemma of Archimedes about a Bisected Segment
Tangent Points on a Semicircle
Area of a Triangle inside the Incircle
Tangent Circles and Parallel Diameters
Adams' Circle and the Gergonne Point
Dissection of Two Truncated Octahedra into a Cube
Hanegraaf's Dissection of a Truncated Octahedron into a Hexagonal Prism
A Rotating Reuleaux Triangle
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
Dissection of a Cube into Two Kinds of Triacontahedra
The Minkowski Sum of Two Triangles
Theorem of the Owl's Eyes
Dissection of Three Bilunabirotundas and a Dodecahedron into Rhombic Solids
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