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Plane Geometry
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Demonstrations 861  880 of 1120
Freese's TwoOctagonsintoOne Dissection
Any Quadrilateral Can Tile
Cube Net or Not
Any Triangle Can Tile
Lines Parallel to the Sides of a Triangle
Mixtilinear Incircles
Two Lines Determine a Circle
Linear Transformations of a Polygon
Loculus of Archimedes
Matrix Transformation
Golden Spiral
The Minkowski Sum of a Disk and 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
Interior and Exterior Angles of Equilateral Figures
Cofunction Identities for Sine and Cosine
Incircles and a Cevian
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