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# Geometry vocab unit1

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

Point | No length, width, depth Shows location |

Line | No width or depth, has infinite length |

Plane | No depth, has infinite length and width |

Collinear | Points on the same line |

Coplanar | Points, lines, angles, etc in the same plane |

Non-collinear | Points not on the same line (3 or more points; any 2 points are always collinear) |

Non-coplanar | Not lying in the same plane |

Parallel lines | Coplanar lines that never intersect |

Perpendicular lines | Lines that intersect to form a right angle |

Segment bisector | Line, ray, or segment that intersects another segment at its midpoint |

Angle bisector | A ray through the vertex of an angle that divides the angle into 2 congruent angles |

Midpoint | The point exactly in the middle of a segment, dividing it into 2 congruent segments |

Congruent | Equal in size and shape (physically) |

Acute angle | Angle whose degree measure is greater than 0 but less than 90 |

Right angle | Angle whose degree measure is 90 |

Obtuse angle | Angle whose degree measure is greater than 90 but less than 180 |

Linear pair | 2 adjacent angles whose non-common sides form a line |

Adjacent angles | Angles sharing a common vertex and a common side |

Vertical angles | Angles formed by intersecting lines, sharing only a common vertex |

Ray | Part of a line having one endpoint and infinite length in one direction |

Segment | Part of a line with an endpoint on each end; has finite length |

Angle | Two non-collinear rays sharing a common endpoint |

Complementary angles | 2 angles whose measures add up to be 90 degrees |

Supplementary angles | 2 angles whose measures add up to be 180 degrees |

Polygon | A closed figure made from coplanar, non-collinear segments |

Vertex | The "corner" point of an angle; the common endpoint |

Opposite Rays | Collinear rays having only their endpoints in common |

Intersection | Where two figures meet |

Created by:
svore