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# Chapter 1 Vocabulary

### Geometry

Question | Answer |
---|---|

Has no dimensions and is represented by a dot | Point |

A line that consists of two endpoints and all of the points in between | Line Segment |

It has two dimensions and resembles a floor or wall. It extends without end in all directions. | Plane |

Has one dimension and is represented by a line with two arrowheads, but it extends without end | Line |

Points that lie on the same line | Collinear Points |

Points that lie on the same plane | Coplanar Points |

The point or the set of points two or more figures have in common | Intersection |

Consists of one endpoint and goes on in one directions without ending | Ray |

A rule that is accepted without proof | Postulate or Axiom |

The real number or numbers that corresponds to a point | Coordinate |

The absolute value of the difference between two coordinates | Distance |

Line segments that have the same length | Congruent Segments |

The point that divides the segment into two congruent segments | Midpoint |

A point, ray, line, line segment, or plane that intersects the segment at its midpoint | Segment Bisector |

Two different rays with the same endpoint | Angle |

Each ray of an angle | Sides of Angles |

The endpoint of an angle | Vertex of Angles |

The absolute value of the difference between the real numbers measured on a protractor | Measure of Angle |

An angle that measure between 0° and 90° | Acute Angle |

An angle that measure exactly 90° | Right Angle |

An angle that measure between 90° and 180° | Obtuse Angle |

An angle that measures exactly 180° | Straight Angle |

Two or more angles that have the same measure | Congruent Angles |

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

The sum of two angles equals 90° | Complementary Angles |

The sum of two angles equals 180° | Supplementary Angles |

Two angles that share a common vertex and side, but have no common interior points | Adjacent Angles |

Two adjacent angle and their common sides are opposite rays | Linear Pair |

Two angles whose sides form two pairs of opposite rays | Vertical Angles |

A closed plane figure formed by three or more line segments and each side intersects two sides one at each endpoint. | Two Properties of Polygons |

The endpoint of each side of a polygon | Vertices of Polygons |

Determined by the number of sides “n-gon” | Naming Polygons |

A polygon that contains no point in the interior of the polygon | Convex Polygon |

A polygon that contains a point in the interior of the polygon | Concave Polygon |

All sides are congruent | Equilateral |

All angles in the interior of the polygon are congruent | Equiangular |

A convex polygon that is both equilateral and equiangular | Regular Polygon |

3-sided polygon | Triangle |

4-sided polygon | Quadrilateral |

5-sided polygon | Pentagon |

6-sided polygon | Hexagon |

7-sided polygon | Heptagon |

8-sided polygon | Octagon |

9-sided polygon | Nonagon |

10-sided polygon | Decagon |

12-sided polygon | Dodecagon |

Distance around a figure | Perimeter |

Distance around a circle | Circumference |

Amount of surface covered by a figure | Area |

A chord that passes through the center of a circle | Diameter |

A segment whose endpoints are the center of the circle and a point on the circle | Radius |

Created by:
warnockj