| A | B |
|---|
| point | an exact location in space |
| line segment | a part of a line that includes two points called endpoints and all the points between them |
| endpoints | the points at either end of the line segment |
| line | a straight path of points that continues without end in both directions with no endpoints |
| ray | part of a line that has one endpoint, and continues without end in one direction |
| plane | a flat surface that continues without end in all directions |
| one-dimensional | measure in only one direction, such as length |
| two-dimensional | measure in two directions, such as length and width |
| angle | a figure formed by two line segments or rays that share the same endpoint |
| vertex | a shared endpoint |
| degree | unit used for measuring angles |
| acute angle | an angle that has a measure less than a right angle (less than 90 degrees) |
