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Plane Geometry
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Demonstrations 101  120 of 1020
Deriving the Formula for the Area of a Parallelogram
Dissecting an Equilateral Triangle into Four Equilateral Triangles
Intersecting Line Segments
A Test for the Convexity of a Quadrilateral
Regular Tilings
How to Avoid a Collision
Dissecting a Square to Four Squares
Bisecting an Angle Efficiently
Garfield's Proof of the Pythagorean Theorem
Design a Tile for the p3 Wallpaper Group
The Facilities Location Problem
Trisecting an Angle Using a Lemniscate
Arc Length of a Logarithmic Spiral
Dudeney's Proof of the Pythagorean Theorem
The Areas of a Parallelogram and a Rectangle with the Same Base and Height Are Equal
Mechanism for Drawing a Logarithmic Spiral
Another OctagramToSquare Dissection
Drawing a Logarithmic Spiral
Trisecting an Angle Using Tschirnhaus's Cubic
Sum of Medians Divided by the Perimeter
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