Congruent vs Similar

If the shapes being compared are exactly equal in size and shape, then they are congruent. Congruent sides or segments have the exact same length. Congruent angles have the exact same measure.
Note: Congruent segments, sides, and angles are often marked.
Example: Screen Shot 2013-03-06 at 11.46.38 PM

If the shapes being compared are exactly the same shape but not same size, then they are similar.
Example:Screen Shot 2013-03-06 at 11.47.34 PM

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