| A | B |
|---|
| Acute Angles | An angle with measure greater than 0 degrees and less than 90 degrees. |
| Adjacent Angles | Angles that share a common vertex and side, but have no common interior points. |
| Angle | Consist of two different rays that have the same initial point. |
| Angle Bisector | A ray that divides the angle into two congruent angles. |
| Biconditional Statement | “p if and only if q”, equivalent to “if p then q” and “if q then p”. |
| Collinear | Points, segments, or rays that lie on the same line. |
| Compass | A tool used to draw circles. |
| Complementary Angles | Two angles whose sum of measure is 90 degrees. |
| Conclusion | The ‘then’ part, or q, of a conditional statement. |
| Congruent Angles | Two angles that have the same measure. |
| Congruent Segments | Two segments that have the same length. |
| Converse | Formed by interchanging the hypothesis and conclusion of a conditional statement, “if q then p”. |
| Counterexample | Needed to demonstrate that a conditional statement is false. The hypothesis is fulfilled and the conclusion is not. |
| Exterior of an Angle | Not on the angle or in the interior of the angle. |
| Floor | The plane where our pencils, folders, etc. are placed while we grade our papers. |
| Hypothesis | The ‘if’ part, or p, of a conditional statement. |
| Interior of an Angle | Between the points that lie on each side of an angle. |
| Line | Understood to be straight, have no thickness, contain an infinite number of points, and extend infinitely in two directions. |
| Line Segment AB | Consist of the endpoints A and B and all the points on line AB that lie between A and B. |
| Linear Pair | Two adjacent angles whose noncommon sides are opposite rays. |
| Measure of an Angle | A number greater than 0 and less than or equal to 180. |
| Midpoint | A point that divides a segment into two congruent segments. |
| Obtuse Angle | An angle with measure greater than 90 degrees and less than 180 degrees. |
| Plane | Understood to be a flat surface that extends infinitely in all directions. |
| Perpendicular | Lines and/or planes that intersect to form a right angle. |
| Protractor | A tool used to measure angles. |
| Ray AB | Consists of the initial point A and all points on line AB that lie on the same side of A as B lies. |
| Right Angle | An angle with the measure of 90 degrees. |
| Segment Bisector | A segment, ray, line, or plane that intersects a segment at its midpoint. |
| Straight Angle | An angle that measures 180 degrees. |
| Supplementary Angles | Two angles whose sum of measures in 180 degrees. |
| Vertical Angles | Two angles whose sides form pairs of opposite rays. |
