| A | B |
| point | undefined term with no dimensions |
| line | undefined term with length |
| plane | undefined term with length and width |
| definition | a statment that clarifies or explaind the meaning of a word or phrase |
| undefined term | terms accepted to be used to define other terms |
| collinear | lying on the same line |
| coplanar | lying on the same plane |
| line segment | part of aline with two endpoints |
| endpoints | the points at the end of a segment or an arc |
| congruent segments | two or more segments with the same measurements |
| midpoint of a line segment | middle of a segment |
| bisect | to divide into two congruent parts |
| ray | part of a line with one endpoint |
| congruent | has the same measurement |