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Geometry
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Demonstrations 2121  2140 of 3070
Car Traveling at Night
Area of a Disk
3D Graph of a General Quadratic Form
Completing the Square
Bessel Function Lissajous Figures
Wunderlich Curves
Sierpinski 3D Arrowhead Curve
Beraha's Conjecture, Wheels, and Cyclic Graphs
Spheroidal Foci
Turning a Punctured Torus Inside Out (Variation)
Altitudes and Incircles
An Efficient Test for a Point to Be in a Convex Polygon
A Collinearity Involving an Excircle, the Incircle, and the Circumcircle
D'Arcy Thompson's Affine Fish Transformations
The Ratio of Surface Area to Volume for a Cube and a Sphere
Lamé's Ellipsoid and Mohr's Circles (Part 1)
The Desargues Configuration
Points Symmetric to the Orthocenter with Respect to the Sides of a Triangle
Visual Computation of Three Geometric Sums
Reflections of a Point in the Midpoints of a Triangle's Sides
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