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Demonstrations 321  340 of 446
Areas of Parallelograms and Trapezoids
Two Hinged Dissections
Théorème de Pappus (French)
Products of Diagonal Lengths in the Regular Polygon
A Cyclic Quadrilateral Concurrency
A Parallelogram with Vertices on Two Circles
Area of a Hexagon Formed by the Vertices and Altitude Extensions of a Triangle
Recursively Defined Partial Tilings of the Plane
Ammann Tiles
Voronoi Kaleidoscope
Dual Billiards
Miter Joint and Fold Joint
Mitering a Closed 3D Path
Point in Triangle
Zonogons: Minkowski Sums of Line Segments in 2D
Dissecting a Hexagon into Four Smaller Hexagons
SelfIntersections in a Polygon
The Spatial Midpoint Quadrilateral Theorem
A Hexagon with Opposite Sides Parallel
The Circumcircle of the Orthocenter and Two Vertices and a Parallelogram
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