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Plane Geometry
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Demonstrations 21  40 of 1029
Ratios of the Areas of an Internal Hexagon to Its Star to the External Hexagon
Enlargement in Two Dimensions
Triangle Altitude
Tiles with Finite Convex Spectra
Japanese Theorem for Cyclic Polygons
Irregular Tilings
Hirano's Construction of a Regular Pentagon
Making the Three Areas Defined by Congruent Overlapping Circles Equal
On Which Side of a Directed Line Is a Point?
Brianchon's Theorem
Angle of Intersection of Two Circles
Multiple Reflections in Two Mirrors
The Pedal and Antipedal Triangles
Exact Trilinear Coordinates
Orthologic Triangles
The Geometry of the Steiner Tree Problem for up to Five Points
Constructing a Steiner Tree for Five Points
Circle Inversion of Basic Figures
Cumulative Area under a Cycloid versus the Area of Its Rolling Circle
G^1 Hermite Interpolation with PythagoreanHodograph Cubic Curves
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