| A | B |
|---|
| Point | shows location with a dot |
| Line | Infinite number of points going in opposite direction |
| Plane | flat surface, no end needs 3 pts not on the same line |
| Line segment | part of a line, 2 end points |
| Ray | part of a line with one end point |
| Angle | 2 rays with a common end point |
| opposite rays | 2 rays with the same endpoint going in opposite directions |
| intersect | where lines or segments cross over |
| complementary angles | 2 angles that add up to 90 degrees |
| Supplementary angles | 2 angles add up to 180 degrees |
| acute angle | 0-90 degrees |
| obtuse angle | 90-180 degrees |
| straight angle | equals 180 degrees |
| perpendicular | 2 lines that intersect |
