Cornell University
Cornell University: Isometries and Patterns
Shows the different kinds of isometries and patterns, and gives examples of each kind. Includes definitions, terminology, examples, and problems.
Other
Mega Mathematics: Graphs and Graph Theory
Contains a clear explanation of the basic terminology of graph theory. The useful for a first introduction to graphs and graph theory.
Other
Los Alamos National Laboratory: Games on Graphs
Learn to understand graphs and graph theory by playing games from Los Alamos National Laboratory. The site also provides definitions and related links.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Graph Theory
Find a quick, concise explanation of graph theory. Examples are given and clearly explained.