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# Unit 1 Geometry

### Essential Geometry Baldwin County

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

Acute Angle | An angle with measure between 0 degrees and 90 degrees. |

Adjacent Angles | Two angles with a common vertex and side but no common interior points. |

Angle | Consists of two different rays that have the same initial point. |

Angle Bisector | A ray that divides an angle into two adjacent angles that are congruent. |

bisect | To divide into two congruent parts. |

collinear points | Points that lie on the same line. |

compass | A construction tool used to draw arcs. |

complementary angles | Two angles whose measures have the sum of 90 degrees. |

congruent segments | Segments with the same length. |

coplanar points | Points, lines, rays, or segments that lie in the same plane. |

intersect | To have one or more points in common. |

line | Exists in one dimension and extends without end in opposite directions. |

linear pair | Two adjacent angles whose non common sides are opposite rays. |

midpoint | A point that bisects a segment into two congruent parts. |

obtuse angle | An angle with measure between 90 degrees and 180 degrees. |

plane | Exists in two dimension and extends in all directions without end. |

point | A location that has no dimension. |

ray | Part of a line that consists of an initial point and all points extending from that point. |

segment | Part of a line that consists of two endpoints and all the points between. |

supplementary angles | Two angles whose measures have the sum of 180 degrees. |

vertical angles | Two angles whose sides form two pair of opposite rays. |

Linear Pair Postulate | If two angles form a linear pair, then they are supplementary. |

Vertical Angles Theorem | Vertical Angles are Congruent. |

theorem | A true statement that follows as a result of other true statements. |

Geometry | The mathematics of the properties, measurement, and relationships of points, lines, angles, surfaces, and solids. |

opposite rays | Two rays that have a common endpoint and form a straight line. |

postulate | A geometry rule that is excepted as true without proof. |

polygon | A closed plane figure with 3 or more line segments called sides and each side intersects exactly two sides. No two sides are collinear. |

convex | A polygon with all its interior angles less than 180°. |

concave | Non-convex polygon. |

equilateral | Polygon with all sides congruent. |

equiangular | Polygon with all angles congruent. |

regular polygon | A convex polygon that is both equilateral and equiangular. |

Created by:
kwilliams204