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Demonstrations 21  40 of 458
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
Obtuse Random Triangles from Three Parts of the Unit Interval
How the Trigonometry Functions Are Related
Obtuse Random Triangles from Three Points in a Rectangle
A Geometric Limit Problem
Cylinder Area Paradox
Dissecting One Equilateral Triangle into Seven
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