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Plane Geometry
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Demonstrations 121  140 of 996
Generalized Trisection Construction
Dougall Theorem II: Inscribed Triangles
Six Triangle Orbits
The Brocard Points and Neuberg Circles of a Triangle
Inscribe a Scaled Copy of a Triangle in Another Triangle
Problems on Circles XV: Bar Fixed to Two Rotating Circles
Almost Equilateral Triangles
Generalized Inscribed and Escribed Triangles
Intersection of Sectors
Divide Triangles
Recursive Exercises XIII: Nested Pentagons
The Eratosthenes Machine for Finding the Cube Root of Two
Trisection by Sliding a Line
Pascal's Angle Trisection
Theobald's Dissection of a Heptagon to a Pentagon
Find the Angle Measure in a Regular Polygon
Lindgren's Dissection of a Pentagon to a Hexagon
1992 CMO Problem: Cocircular Orthocenters
Dissection of a Maltese Cross to a Square
Dissecting a Dodecagram {12/2} to a Square
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