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Plane Geometry
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Demonstrations 21  40 of 1106
Dissection of a Regular Dodecagon into Three
Dissection of One Hexagram into Seven
Ford Circles with Variable Radii
Area of a Quadrilateral within a Triangle
Op Art with Polygon Spirals
Recursive Similar Triangles
Rhomboidal Stars
Watt's Lemniscoidal Linkage
Freese's Dissection of a Hexagram into Three Congruent Hexagrams
Freese's Dissection of a Dodecagram into a Hexagram
Construction for Three Vectors with Sum Zero
Cunningham's Simply Connected Kakeya Set
OneHalf the Apothem Times the Perimeter
Rolling a Polygon on Another Polygon
Rolling a Regular Polygon on the Unit Circle
Frederickson's Dissection of a Regular Dodecagon into Two Congruent Regular Dodecagons
Voronoi Diagrams in TwoDimensional Regions
Voronoi Diagrams for European Cities
Kakeya Needle Problem
Frederickson's Second Dissection of an Octagon to Five Octagons
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