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Demonstrations 641  660 of 818
Compound Interest Table
Proposition 3, Book XII, Euclid's Elements
Collocation by Symmetric Conditional Probability
Any Triangle Can Tile
Letter Products
Gematria (Letter Sums)
A Lemma of Archimedes about a Bisected Segment
Tangent Points on a Semicircle
Tangent Circles and Parallel Diameters
A Rotating Reuleaux Triangle
Perpendiculars to a Chord
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
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