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Plane Geometry
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Demonstrations 141  160 of 1020
Exterior Tangents to Three Circles
Diocles's Solution of the Delian Problem
Clairaut's Angle Trisection
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
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