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Plane Geometry
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Demonstrations 21  40 of 1097
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
Frederickson's Hinged Dissection of Five Decagons to One
Fair Sharing of an Equilateral Triangular Pizza
Lindgren's Symmetrical Decompositions of Regular 2nGons
Four General Unfoldings of a Cube
Frederickson's Dissection of an Octagon to Five Octagons
Golden Lines in an Equilateral Triangle
Olympic Logos Based on Hanegraaf's Dissection of a Dodecagon to Five Dodecagons
Another Hinged Dissection of One Pentagon to Five Pentagons
Logos Based on a Dissection of One Pentagon to Five Pentagons
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