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Demonstrations 281  300 of 393
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
Equilateral Triangle to Square
Albrecht Dürer's Pentagon of 1525
Classifying Quadrilaterals
Rectangles: Perimeter and Area
Perpendicular Lines Generated by a Quadrilateral
Four Concurrent Lines in a Cyclic Quadrilateral
Estimating Perimeter and Area of Simple Polygons
Signed Area of a Polygon
Dissecting an Ngram into Two Smaller Ngrams
Lindgren's Dissection of an Octagram into an Octagon
Lindgren's Dissection of One Octagram {8/3} into Two
Lindgren's Dissection of One Octagram into Two
Lindgren's Dissection of One Decagram {10/3} into Two Pentagrams {5/2}
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