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Plane Geometry
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Demonstrations 781  800 of 1042
Dissecting a Decagon into Two Pentagons and Two Pentagrams
TwoOctagonsintoOne Dissection in Two Steps
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
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