| A | B |
|---|
| Point | Usually represented by a small dot & identified by a letter; it has no dimension |
| Line | An endless straight path; represented by a straight line with two arrowheads |
| Line Segment | Part of a line between two endpoints |
| Ray | A part of a line that has one endpoint (initial point) and goes forever in one direction |
| Plane | An endless flat surface; usually represented by a shape like a tabletop or wall |
| Conjecture | An unproven statement based on observations |
| Inductive Reasoning | The process of looking for patterns and making conjectures |
| Counterexample | An example that shows that a conjecture is false |
| Collinear Points | Points that lie on the same line |
| Coplanar Points | Points that lie on the same plane |
| Opposite Rays | Two rays with a common initial point (endpoint) that extend in opposite directions |
| Intersection | The set of points the figures have in common |
| Protractor | The semicircular instrument used to measure and/or construct an angle |
| Postulates (Axioms) | Rules that are accepted without proof |
| Coordinate | The real number that corresponds to the point |
| Distance (Length) | The absolute value is the difference between the coordinates of two points |
| Between | When three points lie on a line, you can say that one of them is between the other two |
| Distance Formula | The formula for computing the distance between two points in a coordinate plane |
| Congruent Segments | Segments that have the same length |
