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# Geometry-Chapter 1

### Geometry-Chapter 1 Vocabulary

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

A word that does not have a formal definition, but there is agreement about what the word means. | undefined term |

Terms that can be described using known words. | defined terms |

A figure that has no dimension, is usually represented by a dot. It is one of the undefined terms. | point |

A figure that has two dimensions and is usually represented by a shape similar to a wall or floor, It is one of the undefined terms. | plane |

A figure that has one dimension and is usually represented by a straight line with two arrowheads to indicate it extends without end in two directions. It is one of the undefined terms. | line |

Points that lie on the same line. | colinear |

Points that lie on the same plane. | coplanar |

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

A place where something ends or is complete. | endpoint |

Part of a line that consists of a point called an endpoint and all points on the line that extend in one direction. | ray |

Two rays that lie on the same line, share a common endpoint but extend in opposite directions. | opposite rays |

The set of all points that two or more geometric figures have in common. | intersection |

A rule that is accepted without proof. | postulate |

The real number that corresponds to a point on a line. | coordinate |

The absolute value of the difference of the coordinates of the points. | distance between two points |

Line segments that have the same length. | congruent segments |

The point that divides or bisects a segment into two congruent segments. | midpoint |

A point, ray, line, line segment, or plane that intersects a segment at its midpoint. | segment bisector |

Consists of two different rays with the same endpoint | angle |

The endpoint of an angle. | vertex |

A ray that divides an angle into two angles that are congruent. | angle bisector |

Two angles that have the same measure. | congruent angles |

An angle measuring between 0 and 90 degress. | acute angle |

An angle measureing 90 degrees. | right angle |

An angle measuring between 90 and 180 degrees. | obtuse angle |

An angle measuring 180 degrees. | straight angle |

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

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

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

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

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

A closed plane figure with the following properties: 1. It is formed by three or more line segments called sides. 2. Each side intersects exactly two sides, one at each endpoint, so that no two sides with a common endpoint are collinear. | polygon |

A polygon such that no line containing a side of the polygon contains a point in the interior of the polygon. | convex |

A polygon that is not convex. | concave |

A polygon with "n" number of sides. | n-gon |

A polygon with all of its sides congruent. | equilateral polygon |

A polygon with all of its interior angles congruent. | equiangular polygon |

A polygon that has all sides and all angles congruent. | regular polygon |

The distance around the outside edge of a flat object. | perimeter |

The amount of surface covered by a figure. | area |

The distance across a circle through its center. | diameter |

The distance from the center of a circle to any point on the circle. | radius |

The distance around a circle. | circumference |

The set of all points. | space |

A segments whose endpoints are two non-consecutive vertices. | diagonal |

Created by:
aelohaus