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Demonstrations 1  20 of 161
Hirano's Construction of a Regular Pentagon
Campanus's Sphere
Proposition 7, Book XII, Euclid's Elements
Country Groups
Sphere Rolling on Rails
Three Proofs of the Pythagorean Theorem
The Euclidean Algorithm and Simple Continued Fractions
Three Coalescing Soap Bubbles
Motion of Pendulum Interrupted by a Peg
Calculating the Earth's Circumference at Any Date from Any Location
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
World Energy: Electricity, Oil, and Gas
Archimedes' Approximation of Pi
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