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Demonstrations 1 - 20 of 41
Three Proofs of the Pythagorean Theorem
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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
Da Vinci's Proof of the Pythagorean Theorem
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