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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 had 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 measure have a sum of 180 |
| Adjacent angle | 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 definition 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 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 straighthedge |
| 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 all 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:
Ovillalba