| A | B |
|---|
| line | A set of points that forms an endless straight path in opposite directions. |
| line segment | A part of a line with two endpoints. |
| parallel lines | Lines that never cross. |
| intersecting lines | lines that cross at one point. |
| angle | Two rays with the same endpoint. |
| ray | A part of a line with only one endpoint. |
| perpendicular lines | Two lines, line segments, or rays that make a right angle. |
| right angle | An angle that makes a square corner. |
| obtuse angle | An angle that is open more than a right angle. |
| acute angle | an angle that is open less than a right angle. |
