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Triangles
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Demonstrations 161  180 of 451
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
Macaulay's Triangle and Trapezoid Hinged Dissection
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