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Triangles
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Demonstrations 161  180 of 452
Theorem of the Equal Incircles
Folding an Equilateral Triangle in a Square
The Malfatti Problem
Enumerating Pythagorean Triangles
Pólya's SpaceFilling Curve
The Eutrigon Theorem
A Concurrency from the Reflection of the Incircle's Contact Points across the Incenter
Concurrency via Midpoints
A Triangle Formed by the Centers of Three Circles
Concurrency Induced by a Cevian
A Line Associated with an Excircle
Gauss's Line
Twin Pythagorean Triples
Hinged Dissection of Equilateral Triangles
TriangleClosed Planar Sets
Area of a Quadrilateral by Triangulation
Mamikon's Proof of the Pythagorean Theorem
Napoleon's and van Aubel's Theorems
Lindgren's TwoTrianglestoOne Hinged Dissection
Integral Grid Triangles with Consecutive Side Lengths
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