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Geometry
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Demonstrations 2141  2160 of 2754
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
Normed Line
Cube Net or Not
Any Triangle Can Tile
Lines Parallel to the Sides of a Triangle
Mixtilinear Incircles
Lebesgue 3D Curves
Cassini Ovals and Other Curves
Tangent Lines to Exponential and Logarithmic Functions through the Origin
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