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Triangles
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Demonstrations 61  80 of 499
The Pedal and Antipedal Triangles
Exact Trilinear Coordinates
Orthologic Triangles
Geometric Series Based on Equilateral Triangles
Generalized Straightedge and Compass Fractal
Da Vinci's Construction of an Ellipse
Signed 2D Triangle Area from the Cross Product of Edge Vectors
Three Proofs of the Pythagorean Theorem
Congruent Numbers
Halving the Perimeter of a Zigzag Polygon
Geometry of Cubic Polynomials
Decomposition into Isosceles Triangles with Angles That Are Multiples of Pi/4
A TwistHinged Dissection of Triangles
Lindgren's Dissection of a Quadrilateral to a Triangle
Decomposition of Some Polygons to IsoPenta Triangles
Dissection of One Triangle to Another
The Begonia Point
An Application of the GergonneEuler Theorem
Dissection of Five Equilateral Triangles into One
Dissection of a Sphinx into a Triangle
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