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Plane Geometry
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Demonstrations 101  120 of 1206
Roulette (Hypotrochogon) of a Polygon Rolling inside Another Polygon
Roulette (Epitrochogon) of a Regular Polygon Rolling around Another Regular Polygon
The Nagel Line
Power of a Point Theorem
Roulette (Epitrochogon) of a Disk Rolling around a Regular Polygon
A Visual Proof of Thales's Intercept Theorem
SwingandTwist Hinged Dissection of One Regular Heptagon into Seven
Convergent Series of Rectangles to Fill a Unit Square
Euclid's Formula and Properties of Pythagorean Triples
Logarithmic Spirals and Möbius Transformations
Polar Plots Drawn by a Mechanical Linkage
Dissection of an Octagram into Five Octagrams
Rotation of the Euler Line of a Triangle
Drawing Some Plane Curves Using Envelopes of Lines
Doyle Spirals and Möbius Transformations
Tetrahedron Centers
Hinged Dissection of a Regular Heptagon into Eight Smaller Ones
Hinged Dissection of a Hexagram into Seven Smaller Ones
Dissection of a Regular Dodecagon into Six Smaller Ones
Dissection of an Dodecagram into Three Dodecagrams
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