| A | B |
|---|
| point | exact location |
| line | straight path that goes on forever in both directions |
| line segment | part of a line that contains two endpoints |
| ray | part of a line that begins at one endpoint and goes on forever in only one direction |
| plane | flat surface that goes on forever in all directions |
| acute angle | angle that measures less than 90 degrees |
| right angle | angle that measures exactly 90 degrees |
| obtuse angle | angle that measures larger than 90 degrees |
| acute triangle | triangle that contains all angles measuring less than 90 degrees each |
| right triangle | triangle that contains one angle that measures 90 degrees |
| obtuse triangle | triangle that contains one angle that measures larger than 90 degrees |
