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# 8 CCSSM GEO PT 2

### 8th COMMON CORE GEOMETRY PART 2 - COMPLETE

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

parallel lines | Two lines on a plane that never meet. They are always the same distance apart. |

Pi | The ratio of a circle's circumference to its diameter; Equal to 3.14159265358979323846... (the digits go on forever without repeating) A rough approximation is 22/7 , but that is not very accurate |

pre-image | The original figure prior to a transformation |

Pythagorean triple | set of positive integers, a, b and c that fits the rule: a squared + b squared = c squared |

PythagoreanTheorem | In a right angled triangle the square of the hypotenuse is equal to the sum of the squares of the other two sides. It is stated in this formula: a squared + b squared = c squared. |

Radius | the distance between the center and any point on a circle |

A’ | “A prime” |

reflection | A transformation that reflects a figure in a line; also known as a flip. An image or shape as it would be seen in a mirror |

right triangle | a triangle with one right angle |

rigid transformations | also called an isometry; a transformation of the plane that preserves length. Reflections, translations, rotations, and combinations of these three transformations are ____________ |

rotation | A transformation in which a plane figure turns around a fixed center point. In other words, one point on the plane, the center of rotation, is fixed and everything else on the plane rotates about that point by a given angle |

scale factor | The ratio of any two corresponding lengths in two similar geometric figures. |

similarity | having the same shape; having corresponding sides proportional and corresponding angles equal |

sphere | a solid formed by all points in space that are the same distance from a fixed point called the center |

supplementary angles | two angles whose measures have a sum of 180 degrees |

translation | a transformation that moves each point of a figure the same distance in the same direction, also called a slide |

transversal | A line that crosses at least two other lines. |

vertical angles | a pair of opposite angles formed when when two lines meet at a point |

volume | The amount of 3-dimensional space an object occupies. Capacity. |

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artisteacher