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# Module 9 8th Math

### Congruence and Similarity

Term | Definition |
---|---|

Angle Angle Similarity | If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar |

Composition of Transformations | The resulting transformation when a transformation is applied to a figure and then another transformation is applied to its image |

Congruent | Having the same measure |

Corresponding Parts | Parts of congruent or similar figures that are in the same relative position |

Indirect Measurements | A technique using properties of similar polygons to find distances or lengths that are difficult to measure directly |

Similar | If one image can be obtained from another by a sequence of transformations and dilations |

Image | new image |

Preimage | original geometric figure |

Transformation | a change in a figure from its original state to a new state |

Translation | a slide of a figure from one position to another without turning it |

Reflection | a mirror image of a figure that has been flipped across a line |

Line of reflection | the line that a figure flips across |

Center of rotation | a fixed point |

Rotation | a turn about a fixed point |

Clockwise | to turn right |

Counterclockwise | to turn left |

Dilation | a change in which an image gets smaller or larger in size |

Scale factor | ratio of the side lengths of an image to the side lengths of the preimage |

Enlargement | to make bigger |

Reduction | to make smaller |

Center of dilation | the center point that a figure dilates about |