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Triangles
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Demonstrations 121  140 of 565
Wheel Graphs with Integer Edges
Area of a Triangle in the Poincaré Disk
Triangle Altitude
Japanese Theorem for Cyclic Polygons
Radial Tiling
Rotating Pythagoras
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
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