Geometry Definitions - Index
Arbelos Definition by Archimedes
Circle definition.
Concentric Circles Definition.
Euclid's Elements Book I, 23 Definitions. One-page visual illustration.
Trapezoid Definition
Parallelogram Definition.
Sagitta, Definition.
Semicircle Definition.
Tangent Definition.
Ideas for Geometry Projects: Basic Language and Notation Video and News.
