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Geometry
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Demonstrations 2381  2400 of 2997
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
Dissecting an Octagon into Four Smaller Octagons
Tangents to an Excircle
Dissecting a Decagon into Two Pentagons and Two Pentagrams
TwoOctagonsintoOne Dissection in Two Steps
Freese's TwoOctagonsintoOne Dissection
Any Quadrilateral Can Tile
Dissection of a Cube into Five Solids
Proposition 3, Book XII, Euclid's Elements
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