| A | B |
|---|
| point | a unique exact location in space |
| plane | set of points that make a fflat surface |
| line | set of points that make a straight line |
| line segment | part of a line with two endpoints |
| ray | part of a line with only one endpoint |
| angle | two rays with a common endpoint |
| vertex | point in which the endpoints of teo rays meet |
| degree | unit used for measuring angles |
| protractor | tool used to measure angles |
| right angle | angle with measure of 90 degrees |
| acute angle | angle with a measure of between 0 and 90 degrees |
| obtuse angle | angle with a measure of between 90 and 180 degrees |
| straight angle | angle measuring 180 degrees |
| complementary angle | two angles whose measure add up to 90 |
| adjacent angle | two angles that share a side and vertex |
| supplementary angle | two angles whose measuresadd up to 180 degrees |
| perpendicular lines | lines which intersect to form right angles |
| parallel lines | lines in the same plane that never intersects |
| compass | a tool used for constructing eg circles |
