| A | B |
|---|
| Right Angle | An angle whose measure is 90'. |
| Obtuse Angle | An angle whose measure is more than 90' but less than 180'. |
| Straight angle | An angle whose measure is 180' Also called a line. |
| Reflex Angle | An angle whose measure is more than 180' but less than 360'. |
| Protractor | a device used to measure angles. |
| Complementary Angles | a pair of angles whose sum is 90'. |
| Suplementary angles | a pair of angles whose sum os 180'. |
| Bisector angle | a ray that divides an angle into two conruent angles. |
| Congruent | have the same measure. |
| Parallel lines | lines in the same plane that do not meet. |
| Intersecting lines | lines in the same plane that meet each other. |
| Skew lines | linesw in different planes that do not meet. |
| Transversal | a line that intersects 2 or more parallel lines. |
| Vertical angles | opposite angles- formed by intersecting lines. |
| Perpendicular lines | lines that meet to form right angles. |
| Midpiont | a piont on a segment that divides the segment into two congrunt pieces. |
| Perpendicular bisector | a line that bisects a segment and forms right angle with the segment |
