| A | B |
|---|
| point | a location in space |
| parallel lines | lines that never intersect and are the same distance apart |
| line | a straight path that has no end |
| ray | part of a line that has one endpoint and goes on forever in one direction |
| angle | two rays that have the same endpoint |
| line segment | part of a line between 2 endpoints |
| intersecting lines | lines that cross at a point |
| perpendicular lines | lines that intersect to form a 90 degree angle |
| acute angle | an angle less than 90 degrees |
| degree | the unit used to measure an angle |
| protractor | a tool used to measure angles |
| obtuse angle | an angle that measures greater than 90 degrees but less than 180 degrees |
| right angle | an angle that measures exactly 90 degrees |
| straight angle | an angle that measures exactly 180 degrees |
