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Geometry
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Demonstrations 2561  2580 of 2973
The Butterfly Theorem
Intersecting Secants Theorem
Magnetic ngon Billiards
A Rose for Valentine's Day
Broken Heart Tangram
Equations for Valentines
Calculating the Distance between Two Inaccessible Points
Nordstrand's Weird Surface
Euler's Triangle Formula
Cyclic Quadrilaterals, Subtriangles, and Incenters
Damped 3D Lissajous Figures
Intersecting Chords Theorem
Maurer Roses
Damped 2D Lissajous Figures
A Greeting from a Surface Plot
Cross Product in Spherical Coordinates
Opposite Angles of a Quadrilateral in a Circle
Largest Triangle Inscribed in a Circle
Problem 11340 of The American Mathematical Monthly
Polynomial Roots in the Complex Plane
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