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Plane Geometry
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Demonstrations 101  120 of 1029
Albrecht Dürer's Nonagon of 1525
Albrecht Dürer's Heptagon of 1525
IsoOptic Curve of the Ellipse
A Concurrency from Midpoints of Arcs of the Circumcircle
A Concurrency of Lines through Points of Tangency with Excircles
Serlio's Ovals
Plato's Shadow Problem
Arbitrary Curves of Constant Width
A Concurrency from Six Pedal Points
Area of a Circle from Sectors
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
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