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Geometry C1
| Term | Definition |
|---|---|
| point | a location in space that is represented by a dot and has no dimension |
| line | one dimensional geometric figure that extends in two opposite directions without end |
| 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 wall |
| endpoints | points that represent the ends of a line segment or ray |
| ray | a geometric figure that consists of the endpoint A and all points on line AB that lie on the same side of point A as point B |
| intersection | the set of points two or more geometric figures have in common |
| postulate/axiom | a rule that is accepted without proof |
| midpoint | the point that divides a segment into two congruent segments |
| segment bisector | a point, ray, line, line segment, or plane that intersects a segment at its midpoint |
| convex polygon | a polygon in which no line that contains a side of the polygon contains a point in the interior of the polygon |
| concave polygon | a polygon in which at least one line that contains a side of the polygon contains a point in the interior of the polygon |
| polygon | a closed plane figure formed by three or more line segments |
| acute angle | an angle that has a measure greater than 0 and less than 90 |
| right angle | an angle that has a measure of 90 |
| obtuse angle | an angle that has a measure greater than 90 and less than 180 |
| straight angle | an angle that has a measure of 180 |
| angle bisector | a ray that divides an angle into two angles that are congruent |
| complementary angles | two angles whose measures have a sum of 90 |
| supplementary angles | two angles whose measures have a sum of 180 |
| adjacent angles | two angles that share a common vertex and side but have no common interior points |
| vertical angles | two angles whose sides form two pairs of opposite rays |
| undefined terms | Words that do not have a formal definitions but there is agreement about what they mean. (point, line, plane) |
| collinear points | Points that lie on the same line |
| coplanar points | Points that lie on the same plane |
| defined terms | Terms that can be described using known words such as point or line. |
| segment | Consists of two endpoints and all the points between them. |
| opposite rays | rays that start at the same point but go away from each other creating a straight line. |
| coordinate | A real number that corresponds to a point on a line. |
| distance | The absolute value of the difference of two coordinates on a line |
| construction | A geometric drawing that uses a limited set of tools, usually a compass and straightedge |
| congruent segments | Line segments that have the same length. |
| between | When three points are collinear, one point is between the other two. |
| vertex of an angle | The common endpoint of two rays. |
| angle | A set of points consisting of two different rays that have the same endpoint |
| sides of an angle | the rays of an angle |
| interior of an angle | The region that contains call the points between the sides of the angle |
| exterior of an angle | Angles that form linear pairs with the interior angles of a polygon. |
| measure of an angle | The absolute value of the difference between the real numbers matched with the two rays that form the angle on the protractor. |
| linear pair | Two adjacent angles whose noncommon sides are opposite rays |
Created by:
shelleypruit
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