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Historical Mathematics
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Demonstrations 61  80 of 414
A Visual Proof of Thales's Intercept Theorem
Euclid's Formula and Properties of Pythagorean Triples
Fate of the Euler Line and the NinePoint Circle on the Sphere
Ramanujan's Strange Formula for Pi
Tetrahedron Centers
Mondrian Art Problem
The Klein Configuration
Babylonian Algorithm for Computing Square Roots
Gettysburg!
Marquand's Representation of Boolean Functions
Using Bernoulli's Formula to Sum Powers of the Integers from 1 to n
Lewis Carroll's Diagrams
Duffin's Sequence for Pi
The 196 Algorithm, ReorderandAdd Algorithm, and RATS Sequence in Different Bases
Golomb Rulers and Fibonacci Sequences
Pál Joints
Wheels of Powered Triangles
Rational Distance Problem
Square of Opposition in Aristotelian Logic
Three Calculations of Pi Before 1800
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