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Geometry
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Demonstrations 2501  2520 of 3124
Dissecting a Dodecagram into a Triangle
Dissecting a Decagram {10/4} into Two Decagons
The Taylor Circle
The Circumcircles of Four Triangles
Polyhedra with Prismatic Symmetry
Hyperbolic Paraboloid Embracing an Elliptic Paraboloid
A Congruent Angle inside the Incircle
The Area of a Triangle inside the Incircle
The Radii of Four Incircles
A Relation between Altitudes of Four Triangles
A Relation between the Contact Triangles of a Triangle
Camera Animations on Circles, Spirals, Helices, and Conical Spirals
Symmetric Decompositions of a Rhombic Triacontahedron
A Parallelogram Defined by the Centers of Four Incircles
A Relation between the Areas of Four Triangles
Three Subtriangles of a Triangle
A Triangle and an External Contact Triangle
Two Polyhedra with D2 Symmetry
Contact Triangles of a Triangle
The Topology of Costa's Minimal Surface
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