| A | B |
|---|
| Conjecture | An unproven statement that is based on observations |
| Inductive Reasoning | A process that includes looking for patterns and making conjectures |
| Counterexample | An example that shows a conjecture is false |
| Point | A location in space |
| Line | Infinitely many points extending in one dimension |
| Plane | Infinitely many points extending in two dimensions |
| Collinear Points | Points that lie on the same line |
| Coplanar Points | Points that lie on the same plane |
| Line Segment | Part of a line consisting of the endpoints and all points between |
| Ray | Part of a line consisting of the initial point and all points in one direction |
| Opposite Rays | Two collinear rays that have the same initial point but go opposite directions |
| Intersect | Two or more geometric figures that have one or more points in common |
| Postulates (axioms) | Rules that are accepted without proof |
| Distance (length) | The absolute value of the difference between coordinates |
| Angle | Two different rays (sides) that have the same initial point (vertex) |
| Interior Point | Any point that lies between the sides of an angle |
| Exterior Point | Any point that does not lie between the sides of an angle |
| Acute Angle | An angle whose measure is less than 90° |
| Right Angle | An angle whose measure is equal to 90° |
| Obtuse Angle | An angle whose measure is more than 90° but less than 180° |
| Straight Angle | An angle whose measure is equal to 180° |
| Adjacent Angles | Two angles that share a common vertex and a side, but have no common interior points |
| Midpoint | The point in the middle of two given points |
| 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 |
| Vertical Angles | Two angles whose sides form two pairs of opposite rays |
| Linear Pair | Two adjacent angles with noncommon sides as opposite rays |
| Complementary Angles | Two angles whose sum is 90° |
| Supplementarv Angles | Two anqles whose sum is 180° |
