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# Geometry Ch.3 part 1

### Vocabulary for Chapter 3 - Parallel & Perpendicular Lines (part 1)

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

Alternate Interior Angles | For two lines intersected by a transversal, a pair of nonadjacent angles that lie on opposite sides of the transversal and between the parallel lines. These angles are congruent. |

Alternate Exterior Angles | For two lines intersected by a transversal, a pair of nonadjacent angles that lie on opposite sides of the transversal and outside the parallel lines. These angles are congruent. |

Corresponding Angles | For two lines intersected by a transversal, a pair of angles that lie on the same side of the transversal and on the same sides of the other two lines. These angles are congruent. |

Same-Side (Consecutive) Interior Angles | For two lines intersected by a transversal, a pair of angles that lie on the same side of the transversal and between the other two lines. These angles are supplementary. |

Same-Side (Consecutive) Exterior Angles | For two lines intersected by a transversal, a pair of angles that lie on the same side of the transversal and outside the other two lines. These angles are supplementary. |

Transversal | A line that intersects two coplanar lines at two different points. |

Parallel Lines | Lines in the same plane that do not intersect. |

Perpendicular Lines | Lines that intersect at 90 degree angles. |

Skew Lines | Lines that are not coplanar, not parallel and do not intersect. |

Parallel Planes | Planes that do not intersect. |

Complementary Angles | Two angles whose measures have a sum of 90 degrees. |

Supplementary Angles | Two angles whose measures have a sum of 180 degrees. |

Vertical Angles | The nonadjacent angles formed by two intersecting lines. These angles are congruent. |

Slope-Intercept Form | One form of a linear equation written as y = mx + b, where m is the slope and b is the y-intercept. |

Point-Slope Form | One form of a linear equation written as y - y1 = m(x - x1), where m is the slope and (x1, y1) is a point on the line. |

Standard Form | One form of a linear equation written as Ax + By = C, where A is a positive, whole number and x and y are located on the same side of the equation. |

Slope Formula | the change in y = (y2 - y1) the change in x (x2 - x1) |

Rise | The difference in the y-values of two points on a line (aka vertical distance). |

Run | The difference in the x-values of two points on a line (aka horizontal distance). |

Slope | A measure of the steepness of a line. If (x1, y1) and (x2, y2) are any two points on the line, the slope of the line, known as m, is represented by the equation m = (y2 - y1)/(x2 - x1). |

Created by:
hillap