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Plane Geometry
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Demonstrations 781  800 of 1047
Three Subtriangles of a Triangle
A Triangle and an External Contact Triangle
Contact Triangles of a Triangle
Dissecting an Octagon into Four Smaller Octagons
Tangents to an Excircle
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
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