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Demonstrations 641  660 of 812
Perpendiculars to a Chord
Proposition 30, Book XI, Euclid's Elements
Proposition 29, Book XI, Euclid's Elements
Proof of Proposition 28, Book XI, Euclid's Elements
World Map Projections
How Zippers Work
Ptolemy's Theorem
Estimating Percentages
Euclid's Proof of the Pythagorean Theorem
Click a Country
The Perpendicular Bisector of a Chord
Time and Weight in the Solar System's Planets
Voronoi Diagrams
Negligible Senescence Scenario
Your Favorite Necktie
Eggs using Spherical Coordinates
Mercury's Perihelion Precession
Multiplying with Lines
Asylum in the United States
Elementary Cellular Automaton Egg
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