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Definition and properties of an undecagon

A helpful scientific calculator that runs in your web browser window.

Vertex definition: Various subtly different definitions of a vertex.

Good introduction to vectors, vector diagrams, and properties. A great science tutorial.

This page contains links to explanations and illustrations, including video demonstrations, of vectors.

A list of identities in regards to vectors and vector calculus

Gives a list of definitions for the overview of vectors.

This is a large fron page site showing properties of vectors with diagrams and explanations.