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# Chapter One

### Lines, Line Segment, Ray, Angles

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

Line Segment | measurable piece of a line with 2 distinct endpoints |

Distance Formula | the distance between two points A (x1,y1) and B (x2, y2) |

Congruent | having the same size AND the same shape |

Congruent Segments | If segments are congruent, they are also equal |

Bisect | to cut in half. A midpoint bisects a segment and gives 2 congruent parts |

Midpoint Formula | xm= x1 + x2/2 and y1 + y2/2. This gives the midpoint values when you are given two other points on a line segment |

Ray | a part of a line with exactly one endpoint. It goes indefinitely long in one direction. Remember in naming a ray that order matters!! |

Angle | 2 rays with a common end point. |

Naming a Ray | Always start with the endpoint!! |

Naming an Angle | Always put the vertex in the middle of the angle name |

Right Angle | an angle which has a measure of 90 degrees |

acute angle | an angle which has a measure less than 90 degrees |

obtuse angle | an angle which has a measure more than 90 degrees |

straight angle | an angle which has a measure of 180 degrees |

angle bisector | a ray that divides an angle |

Adjacent Angles | adjacent angles are next to each other and share a ray. |

Vertical Angles | two non adjacent angles formed by 2 intersecting lines |

Complementary Angles | their measure add to be 90 degrees |

Supplementary Angles | their measure add to a total of 180 degrees |

Perpendicular | to prove something is perpendicular, you need to prove that it is 90 degrees. |

Adjacent Supplementary Angles | same as a linear pair. |

Created by:
amgeometry