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Plane Geometry
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Demonstrations 21  40 of 1071
Ray Tracing for Points in a Polygon
Draw Polygons on Grids
Rational Distance Problem
Coupler Curve Atlas for the FourBar Linkage
Some Irreptiles of Order Greater than 20
Rectangles Reasonably Close to a Given Area
Triangle Radicals
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
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