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Plane Geometry
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Demonstrations 801  820 of 1106
The Product of an Altitude and the Circumradius of a Triangle
An IMO Problem Involving Concurrency
The Product of the Side Lengths of a Triangle
The Medial Triangle and Concurrency at the Nagel Point
Four Concurrent Lines in a Cyclic Quadrilateral
A First Morley Triangle Concurrence
Relations between Some Triangles Associated with Excircles
The Extouch and Intouch Triangles of a Triangle
A Relation between Incircles and Excircles
A Generalization of Hansen's Theorem
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
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