| A | B |
|---|
| Conjecture | an educated guess based on an observed pattern |
| Inductive Reasoning | Making a prediction based upon an observed pattern |
| Deductive Reasoning | Drawing a conclusion based on an elimination of options |
| Plane | a flat surface that continues indefinitely in all directions which is defined by 3 non-collinear points |
| Line | A geometric object that has a minimum of two points and continues indefinitely in two directions |
| Point | A geometric object without dimension. It has a location. |
| Acute Angle | An angle measuring less than 90 degrees. |
| Right Angle | An angle measuring exactly 90 degrees |
| Obtuse Angle | An angle measuring grater than 90 degrees |
| Straight Angle | An angle measuring exactly 180 degrees |
| Complementary Angles | Two or more angles that may or may not be adjacent whose measures add up to 90 degrees |
| Supplementary Angles | Two or more angles which may or may not be adjacent whose measures add up to 180 degrees |
| Linear Pair | Two angles which are adjacent and together form a line. These angles are supplementary. |
| Parallel lines | two lines that never intersect and have the same slope. |
| Perpendicular lines | Two lines that intersect to form four 90 degree angles and whose slopes are a negative reciprocal of one another. |
| Skew lines | Non-coplanar lines that are not parallel and do not intersect. |
| Alternate Interior Angles | Angles formed by parallel lines and a transversal that are on opposite sides of the transversal and both have a line above and below them. These angles are congruent. |
| Alternate Exterior Angles | Angles formed by parallel lines and a transversal that are on opposite sides of the transversal and only one has a line above it and the other has a line below it. These angles are congruent. |
| Corresponding Angles | Angles formed by parallel lines and a transversal that are on opposite sides of the transversal and both are located in the same position but are on different lines which are parallel to one another. These angles are congruent. |
| Same-Side Interior Angles | Angles formed by two parallel lines and a transversal. Both angles are on the same side of the transversal and both have a line above them and below them. These angles are supplementary. |
