# Transformation

Moving a shape so that it is in a different position, but still has the same size, area, angles and line lengths.

Turn, flip or slide are the basic moves.

This is an example of a turn (rotational) transformation.

### The three main Transformations are:

Rotation | Turn! | |
---|---|---|

Reflection | Flip! | |

Translation | Slide! |

After any of those transformations (turn, flip or slide), the shape still has the same size, area, angles and line lengths. | |

If one shape can become another using Turns, Flips and/or Slides, then the two shapes are called Congruent. |

## Resizing

The other important Transformation is **Resizing** (also called** ***dilation, contraction, compression, enlargement* or even *expansion*). The shape becomes bigger or smaller:

Resizing | Resize! |
---|

If you have to use Resizing to make one shape become another then the shapes are not Congruent, they are **Similar**.

## Congruent or Similar

So, if one shape can become another using transformation, the two shapes might be Congruent or just Similar

If you ... | Then the shapes are ... | |
---|---|---|

... only Rotate, Reflect and/or Translate | ## Congruent | |

... need to Resize | ## Similar |

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