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Geometry-Chapter 1 Vocabulary

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
A word that does not have a formal definition, but there is agreement about what the word means.   undefined term  
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Terms that can be described using known words.   defined terms  
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A figure that has no dimension, is usually represented by a dot. It is one of the undefined terms.   point  
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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  
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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  
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Points that lie on the same line.   colinear  
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Points that lie on the same plane.   coplanar  
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Part of a line that consists of two points called endpoints, and all points on the line that are between the endpoints.   line segment  
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A place where something ends or is complete.   endpoint  
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Part of a line that consists of a point called an endpoint and all points on the line that extend in one direction.   ray  
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Two rays that lie on the same line, share a common endpoint but extend in opposite directions.   opposite rays  
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The set of all points that two or more geometric figures have in common.   intersection  
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A rule that is accepted without proof.   postulate  
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The real number that corresponds to a point on a line.   coordinate  
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The absolute value of the difference of the coordinates of the points.   distance between two points  
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Line segments that have the same length.   congruent segments  
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The point that divides or bisects a segment into two congruent segments.   midpoint  
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A point, ray, line, line segment, or plane that intersects a segment at its midpoint.   segment bisector  
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Consists of two different rays with the same endpoint   angle  
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The endpoint of an angle.   vertex  
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A ray that divides an angle into two angles that are congruent.   angle bisector  
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Two angles that have the same measure.   congruent angles  
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An angle measuring between 0 and 90 degress.   acute angle  
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An angle measureing 90 degrees.   right angle  
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An angle measuring between 90 and 180 degrees.   obtuse angle  
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An angle measuring 180 degrees.   straight angle  
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Two angles whose measures have the sum of 90 degrees.   complementary angles  
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Two angles whose measures have the sume of 180 degrees.   supplementary angles  
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Two angles that share a common vertex and side, but have no common interior points.   adjacent angles  
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Two adjacent angles whose noncommon sides are opposite rays.   linear pair  
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Two angles whose sides form two pairs of opposite rays.   vertical angles  
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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  
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A polygon such that no line containing a side of the polygon contains a point in the interior of the polygon.   convex  
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A polygon that is not convex.   concave  
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A polygon with "n" number of sides.   n-gon  
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A polygon with all of its sides congruent.   equilateral polygon  
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A polygon with all of its interior angles congruent.   equiangular polygon  
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A polygon that has all sides and all angles congruent.   regular polygon  
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The distance around the outside edge of a flat object.   perimeter  
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The amount of surface covered by a figure.   area  
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The distance across a circle through its center.   diameter  
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The distance from the center of a circle to any point on the circle.   radius  
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The distance around a circle.   circumference  
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The set of all points.   space  
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A segments whose endpoints are two non-consecutive vertices.   diagonal  
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