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Geometry
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Demonstrations 3381 - 3400 of 3914
Tangent Circles and Parallel Diameters
Adams' Circle and the Gergonne Point
Dissection of Two Truncated Octahedra into a Cube
A Rotating Reuleaux Triangle
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
Proof of Proposition 28, Book XI, Euclid's Elements
Another Dissection of Two Rhombic Solids into an Icosidodecahedron and a Rhombicosidodecahedron
Dissection of the Oblate Golden Rhombohedron
Napoleon's Theorem
Area of a Parallelogram
Definitions of Hill's Tetrahedra
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