| A | B |
|---|
| Acute Angle | An angle that measures less than 90 degrees |
| Obtuse Angle | An angle that measures greater than 90 degrees but less that 180 degrees |
| Straight Angle | An angle that measures 180 degrees & forms a straight line |
| Complementary Angles | Two angles whose measures have a sum of 90 degrees |
| Supplementary Angles | Two angles whose measures have a sum of 180 degrees |
| Protractor | A tool that is used to measure angles in degrees |
| Degrees | The unit of measure for angles |
| Congruent | Figures that have the same measure & shape |
| Congruent Angles | Angles that have the same measure or size |
| Congruent Line Segments | Line segments that are the same length |
| Midpoint | A point that divides a line segment into two equal parts |
| Bisect | To divide into two equal parts |
| Bisector | A line that divides an angle or line segment into two equal parts |
| Compass | A tool used to draw circles & arcs |
| Straightedge | A tool used to draw straight lines |
| Angle Bisector | A ray that divides an angle into two congruent angles |
| Corresponding Angles | Two angles that lie on the same side of a transversal |
| Alternate Interior Angles | Angles that lie on opposite sides of a transversal & between two parallel lines |
| Alternate Exterior Angles | Two angles that lie on opposite sides of a transversal & outside two parallel lines |
