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Plane Geometry
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Demonstrations 921  940 of 1216
A Parallelogram Defined by the Centers of Four Circumcircles
Estimating Perimeter and Area of Simple Polygons
The Contact Triangle and Two Other Subtriangles
The Nagel Point
Nagel's Theorem
Signed Area of a Polygon
Second DrozFarny Circle
First DrozFarny Circle
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}
Dissecting a Dodecagram into Two Hexagrams
Dissecting a Dodecagram {12/2} into a Hexagram {6/2}
Barrow's Inequality
Lindgren's Dissection of a Pentagram into a Decagon
Dissecting a Hexagram into Three Hexagrams
Dissecting a Dodecagram into a Triangle
Dissecting a Decagram {10/4} into Two Decagons
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