| A | B |
|---|
| point | an exact location in space |
| line | a straignt path of points continuing in both directions |
| ray | a straight path of points continuing in one direction having only one endpoint |
| line segment | a straignt path of points between two points |
| congruent line segments | segments with the same length |
| intersecting lines | lines that meet at a point |
| plane | a flat surface that extends without end in all directions |
| parallel lines | lines in a plane that never meet |
| skew lines | lines that do not lie in the same plane |
| angle | formed by 2 rays that have the same endpoint |
| vertex | the endpoint of an angle |
| sides | rays of the angle |
| protractor | tool for measuring angles |
| degrees | units for measuring angles |
| acute angle | an angle with a measure less than 90 degrees |
| right angle | an angle with a measure of 90 degrees |
| obtuse angle | an angle with a measure greater than 90 degrees less than 180 degrees |
| perpindicular | meet at a right angle |
| congruent | angles which have the same measure |
| complementary angles | two angles whose measures add up to 90 degrees |
| supplementary angles | two angles whose measures add up to 180 degrees |
| polygon | a closed figure made up of line segments |
| regular polygon | polygon with all sides congruent and all angles are the same size (congruent) |
| triangle | 3 sided polygon |
| quadrilateral | 4 sided polygon |
| pentagon | 5 sided figure (polygon) |
| hexagon | 6 sided figure (polygon) |
| octagon | 8 sided figure (polygon) |
