| A | B |
|---|
| A point | is an exact location in space. |
| A line | is a set of points that go on and on in both dirrections. |
| A line segment | is part of a line. It has two endpoints. |
| A ray | is part of a line. It has one endpoint and continues on and on in one direction. |
| An angle | is formed when two rays meet at their end point. |
| The Vertex | is a common endpoint of an angle. |
| A right angle | is an angle that forms a square corner. |
| An obtuse angle | is greater than a right angle (90 degrees). |
| An acute angle | is less than a right angle (less than 90 degress). |
| A straight anle | forms a straight line. |
| Intersecting lines | pass through the same point. |
| Parallel lines | never intersect. |
| Perpendicular lines | insersect to form right angles. |
