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Triangles
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Demonstrations 161  180 of 442
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
An Intuitive Proof of the Pythagorean Theorem
Another Triangle into Hexagram Dissection
Hinged Dissection of an Equilateral Triangle into Two Hexagons
Hinged Dissection of an Equilateral Triangle into a Hexagram
Generator of Pythagorean Triples
Similar Right Triangles
Total Areas of Alternating Subtriangles in a 2ngon
Intersection of an Altitude and a Line through the Incenter
Rhombi at the Incenter of a Triangle
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