| A | B |
|---|
| angle | Two rays with a common endpoint. |
| acute angle | An angle that is less than a right angle. |
| obtuse angle | An angle that is less than a straight angle and greater than a right angle. |
| right angle | An angle that forms a square corner and equals 90 degrees. |
| straight angle | An angle that is a line segment and measures 180 degrees. |
| intersecting lines | Lines that cross at a given point. |
| line | A straight path that goes on and on forever in both directions. |
| line segment | Part of a line that has two end points. |
| parallel lines | Lines that do not intersect. They are the same distance at all points. |
| perpendicular lines | Two lines which form right angles where they intersect. |
| ray | Part of a line that begins at a point and is endless in one direction. |
