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Plane Geometry
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Demonstrations 81  100 of 1088
Doubling a Distance with a Compass
Neat Alternating Tilings of the Plane
Triangulating Random and Regular Polygons
Wheel Graphs with Integer Edges
Tangent Circles to Two Parallel Lines and Passing through a Point
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
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