| A | B |
|---|
| Vertex | The point where two rays meet, creating an angle |
| Acute Angle | An angle that measures less than ninety degrees |
| Right Angle | An angle that measures exactly ninety degrees |
| Obtuse Angle | An angle that measures greater than 90 degrees but less than 180 degrees |
| Sides of an Angle | The rays that make up an angle |
| Congruent Angles | Angles that have the same measure |
| Interior of an Angle | Points that lie between the two sides of an angle |
| Exterior of an Angle | Points that lie outside the two sides of an angle |
| Adjacent Angles | Two angles that share a common vertex and side, but have no common interior points |
| Midpoint | The point that divides a segment into two congruent segments |
| Segment Bisector | A segment, ray, line, or plane that intersects a segment at its midpoint |
| Angle Bisector | A ray that divides an angle into two adjacent angles that are congruent |
| Straight Angle | An angle that measures exactly one hundred eighty degrees |
| Compass | A construction tool used to draw arcs |
| Straightedge | A ruler without marks |
| Construction | A geometric drawing that uses a compass and a straightedge |
| Angle | Two different rays that have the same initial point |
| Bisects | Divides into two congruent parts |
