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Demonstrations 21  40 of 167
Asylum in the United States
Hirano's Construction of a Regular Pentagon
Campanus's Sphere
Proposition 7, Book XII, Euclid's Elements
Country Groups
Three Proofs of the Pythagorean Theorem
The Euclidean Algorithm and Simple Continued Fractions
Three Coalescing Soap Bubbles
Motion of Pendulum Interrupted by a Peg
Dudeney's Proof of the Pythagorean Theorem
Fundamental Theorem of Arithmetic
Gridiron Pendulum
Motion of Pendulum with Varying Length
Leonardo da Vinci's Ornithopter
Equality of a Segment and an Arc in Archimedes's Spiral
Nicomedes's Mechanism for Constructing a Conchoid
Primitive Pythagorean Triples on a Curvilinear Grid Defined by Euclid's Formula
Archimedes' Approximation of Pi
Antikythera Mechanism
Dynamically Updated Probabilistic Galton Board
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