| A | B |
|---|
| line | a series of points that continues in both directions without end |
| point | a specific location in space - it has no size |
| ray | begins at a point and continues in the other direction forever |
| plane | a flat surface that has no thickness |
| line segment or segment | begins and ends at points |
| written as a line with arrows at both ends | line |
| written as a dot | point |
| written with a line with an arrow at one end | ray |
| written with a straight line - NO arrows | segment |
| acute angle | is less than 90 degrees |
| right angle | equals 90 degrees |
| obtuse angle | is over 90 degrees |
| straight angle | equals 180 degrees |
| bisects | divides an angle into two equal parts |
| complementary angles | two angles that add up to 90 degrees |
| supplementary angles | angles that add up to 180 degrees |
| adjacent angles | two angles that are side-by-side - have a common vertex and side |
| vertex | point where two rays meet |
| vertical angles | opposite angles in intersecting lines - will be equal |
| will equal 180 degrees | adjacent angles |
| congruent angles | angles that have the same measure |
| intersecting lines | cross at some point |
| parallel lines | lines that never intersect or cross |
| skew | do not intersect but are not parallel |
| perpendicular lines | lines intersect to form right angles |
