Definition and properties of an undecagon
Math Open Reference

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

Vertex definition: Various subtly different definitions of a vertex.
Math Open Reference

Good introduction to vectors, vector diagrams, and properties. A great science tutorial.
University of Guelph Physics

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

A list of identities in regards to vectors and vector calculus
Math Physics

Gives a list of definitions for the overview of vectors.
Visual Calculus

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