2 CONGRUENCEFigures that match exactly (SHAPE & SIZE) are said to be congruent
3 TRANSFORMATIONS RIGID TRANSFORMATIONS The movement of a figure in a plane from its original position, the preimage, to a new position, the image.RIGID TRANSFORMATIONSTransformations that do not change the size or shape of a figure.
4 Transformations Preimage Image The figure before you move it. Usually named with lettersExample: A, B, AB…ImageThe figure after it has been movedUsually named with a letter and a prime symbol (apostrophe)Example: A’, B’, A’B’…
5 3 Main Types of Transformations TRANSLATIONSROTATIONSREFLECTIONS
6 TRANSLATIONSEvery point of a figure moves in a straight line, and all points move the same distance and in the same direction.