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Plane Geometry
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Demonstrations 141  160 of 1184
Polar Curve Generator with FiveBar Linkage
An American High School Mathematics Examination Question
Congruence Classes of Geoboard Triangles
Triangle Altitudes and Circumradius
Fold and Twist Algorithm for Some Regular nGons
Folding a Strip of Paper to Make an nGon
Lattice Squares of Integer Area
Folding a Strip to Form Regular Odd nGons
Pi = 4?
Making a Strip of Isosceles Trapezoids
Guessing the Symmetry Group
Pythagorean Theorem for Regular Polygons
Area of Parallelogram in Terms of Its Diagonals
Construction of Squares from a Parallelogram
Folding a Strip into a Pentagon
Four Visual Proofs of a Theorem about a Regular Nonagon
Arbitrary Curves of Constant Width
Representations of Trigonometric and Hyperbolic Functions in Terms of Sector Areas
Loyd's Dissection of a Square to Five Different Figures
Folding a Rectangle into an Envelope
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