Is this article simple enough ? I think they should define it more clearly and understandbly - I'm a student and still have got only a little bit idea about congruence. -- (talk) 15:34, 1 March 2008 (UTC)

as it says, if you have two shapes, and you can make them agree by moving around, or rotating one of them, they are congruent. But you are are of course welcome to make the article better--Eptalon (talk) 15:38, 1 March 2008 (UTC)