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Euclid's Elements
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Demonstrations 1  20 of 44
Proposition 7, Book XII, Euclid's Elements
Updated this month
The Euclidean Algorithm and Simple Continued Fractions
Fundamental Theorem of Arithmetic
Campanus's Sphere
The Interior Angles of a Triangle Sum to Pi
Extended Euclidean Algorithm
Pythagorean Theorem
Greek Numerals
Inscribed and Central Angles in a Circle
Angle Bisector Theorem
Proposition 3, Book XII, Euclid's Elements
Any Triangle Can Tile
Proposition 30, Book XI, Euclid's Elements
Proposition 29, Book XI, Euclid's Elements
Proof of Proposition 28, Book XI, Euclid's Elements
Euclid's Proof of the Pythagorean Theorem
The Perpendicular Bisector of a Chord
The Chordal Theorem
How the Altitude Divides the Hypotenuse
Dividing a Right Triangle by the Altitude to the Hypotenuse
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