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Chapter 1 Geometry
| Term | Definition |
|---|---|
| acute angle | angle measure greater than 0 and less than 90 |
| adjacent angles | two angles that share a common vertex and side, but have no common interior points |
| angle | a set of points consisting of two different rays that have the same endpoint |
| angle bisector | a ray that divides an angle into two angles that are congruent |
| axiom | a rule that is accepted without proof |
| between | when three points are collinear, one point is between the other two |
| collinear points | points that lie on the same line |
| complementary angles | two angles whose measures have sum of 90 degrees |
| congruent angles | two angles that have the same measure |
| congruent segments | line segments that have the same length |
| construction | a geometric drawing that uses a limited set of tools, usually a compass and a straightedge |
| coordinate | a real number that corresponds to a point on a line |
| coplanar points | points that lie in the same plane |
| defined terms | terms that can be described using known words, such as point or line |
| distance between two points | the absolute value of the difference of two coordinates on a line |
| endpoints | points that represent the ends of a line segment |
| segment bisector | a point, ray, line, line segment or a plane that intersects the segment at its midpoint |
| sides of an angle | the rays of an angle |
| straight angle | an angle that has a measure of 180 degrees |
| supplementary angles | two angles whose measures have a sum of 180 degrees |
| undefined terms | words that do not have formal definitions, but there is agreement about what they mean |
| vertex of an angle | the common endpoint of the two rays that form an angle |
| vertical angles | two angles whose sides form two pairs of opposite rays |
| weighted average | the average of two points on a number line that are weighted unequally |
| obtuse angle | an angle that has a measure greater than 90 degrees and less than 180 degrees |
| opposite rays | two rays that have the same endpoint and form a line |
| plane | a flat surface made up of points that has two dimensions and extends without end, and is represented by a shape that looks like a floor or a wall |
| point | a location in space that is represented by a dot and has no dimension |
| postulate | a rule that is accepted without proof |
| ray | a part of a line that consists of an endpoint and all points on the line on one side of the endpoint |
| right angle | an angle that has a measure of 90 degrees |
| segment | a part of a line that consists of two endpoints and all points on the line between the endpoints |
| exterior of an angle | the region that contains all the points outside of an angle |
| interior of an angle | the region that contains all the points between the sides of an angle |
| intersection | the set of points two or more geometric figures have in common |
| line | one dimension, represented by a line with two arrowheads, but it extends without end |
| line segment | a part of a line that consists of two endpoints and all points on the line between the endpoints |
| linear pair | two adjacent angles whose noncommon sides are opposite rays |
| measure of an angle | the absolute value of the difference between the real numbers matched with two rays that form the angle on a protractor |
| midpoint | the point that divides a segment into two congruent segments |
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