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Demonstrations 1 - 20 of 43
Fair Sharing of an Equilateral Triangular Pizza
Proposition 1, Book X, Euclid's Elements
Three Proofs of the Pythagorean Theorem
Beautiful Designs Made from Two Knights' Tours
Beautiful Designs Made from the Knight's Tour
Dudeney's Proof of the Pythagorean Theorem
Proof by Induction
Limit Proofs Using Epsilon-Delta
Cosine and Sine of the Sum of Two Angles
Thales's Theorem: A Vector-Based Proof
The Pigeonhole Principle - Disk Coverings
Two Visual Proofs of a Basic Trigonometric Identity
Squares of Sine and Cosine
Dissection Proof of the Addition Formula for Sines
The Medians of a Triangle Divide It into Three Smaller Triangles of Equal Area
The Medians of a Triangle Are Concurrent: A Visual Proof
The Centroid of a Triangle Divides Each Median in the Ratio 1:2
Proving Euler's Polyhedral Formula by Deleting Edges
A Negative Times a Negative Is Positive
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