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Geometry
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Demonstrations 2141  2160 of 3020
Tangent Lines to a Parabola
The Gergonne Point
The Intersection of Circumcircles of Medial Triangles
Waterman Polyhedra
Two Solids Made from Golden Rhombic Solids
Between Sphere and Torus
Linear Function Game
Parabolic Function Game
Motion of a Planet around a Star
Circle of Curvature
Intersecting Circles and a Right Angle
Central Cross Sections of Polyhedra
Calculating Area, Perimeter, and Diagonal Length of a Rectangle
Pappus's Hexagon Theorem
A Cyclic Quadrilateral Concurrency
The Line through the Incenter and Circumcenter
A Collinearity between the NinePoint Center, the Foot of an Altitude, and a Midpoint
A Triangle Formed by the Centers of Three NinePoint Circles
A Parallelogram with Vertices on Two Circles
Area of a Hexagon Formed by the Vertices and Altitude Extensions of a Triangle
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