Includes webpages that focus exclusively about two dimension figures, such as lines, circles, and polygons.
Images of conics by Jill Britton.
A collection of 43 proofs - some interactive - of the Pythagorean theorem.
Explains the basic properties, formulas, theorems and different types of triangles. Includes proofs and illustrations.
A Visual Dictionary of Special Plane Curves with graphics.
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