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Plane Geometry
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Demonstrations 141  160 of 1019
Descartes's Angle Trisection
Pedal Curves of Conics
Incommensurability of the Base and Leg in an Isosceles Triangle
Area of a Triangle
Translation of the Plane
Find the Angle Measure in a Regular Polygon, Part 2
Theobald's Dissection of an Octagon into a Triangle
Graham's Square Root Extractor
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
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