| A | B |
|---|
| ray | a line with a start point but no endpoint |
| point | a dot that shows an exact location |
| vertex | the point where two lines meet, such as in an angle |
| acute angle | angle that measures less than 90 degrees |
| obtuse angle | angle that measures more than 90 degrees |
| right angle | angle formed by perpendicular lines, measures 90 degrees |
| straight angle | angle that measures 180 degrees |
| perpendicular | two lines that intersect and are 90 degrees to each other |
| parallel | two lines that do not and will not intersect because they are an equal distance apart |
| intersecting lines | lines that contain at least one point in common |
