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Demonstrations 1 - 20 of 45
Polyhedra, Spheres, and Cylinders
Updated this week
The Sum of Opposite Angles of a Quadrilateral in a Circle is 180 Degrees
Updated this month
Equidistance and Betweenness in Euclidean Plane Geometry
Proposition 30, Book XI, Euclid's Elements
Proposition 29, Book XI, Euclid's Elements
Proposition 7, Book XII, Euclid's Elements
The Euclidean Algorithm and Simple Continued Fractions
Fundamental Theorem of Arithmetic
The Interior Angles of a Triangle Sum to Pi
Extended Euclidean Algorithm
Inscribed and Central Angles in a Circle
Angle Bisector Theorem
Proposition 3, Book XII, Euclid's Elements
Any Triangle Can Tile
Proof of Proposition 28, Book XI, Euclid's Elements
Euclid's Proof of the Pythagorean Theorem
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