Angle definition
Triangle definition
Polygon definition
Circle definition.
Concentric Circles Definition.
Euclid's Elements Book I, 23 Definitions. One-page visual illustration.
Trapezoid Definition
Parallelogram Definition.
Kite definition and basic theorems.
Sagitta, Definition.
Semicircle Definition.
Tangent Definition.
Arbelos Definition by Archimedes.
Cevian Definition.
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