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Postulates/theorems
| Term | Definition |
|---|---|
| Ruler Postulate | The points on a line can be matched on to one with real numbers. The real number that corresponds to a point is the coordinate of the point. The distance between points A and B, written as AB, is the absolute value of the diff of the corrdiantes A and B |
| Segment Addition Postulate | If B is between A and C, then AB+BC=AC. if AB+BC=AC, then B is between A and C |
| Protractor Postulate | Consider ray OB and a point A on one side of the line OB. The rays of the form ray OA can be matched one to one with the real numbers of 0 to 180 |
| Angle Addition Postulate | if P is in the interior of angle RST, then the measure of angle RST is equal to the sum of the measures of angle RSP and angle PST |
| Two Point Postulate | Through any two points, there exists exactly one line |
| Line Point Postulate | A line contains at least two points |
| Line Intersection Postulate | If two lines intersect, then their intersection is exactly one point |
| Three Point Postulate | Through any three noncollinear points, there exists exactly one plane |
| Plane-Point Postulate | A plane contains at least three noncollinear points |
| Plane-Line Postulate | If two points lie in a plane, then the line containing them lies in the plane |
| Plane Intersection Postulate | If two planes intersect, then their intersection is a line |
| Linear Pair Postulate | If two angles form a linear pair , then they are supplementary |
| Parallel Postulate | If there is a line and a point not on the line, then there is exactly one line through the point parallel to the given line |
| Perpendicular Postulate | If there is a line and a point not on the line, then there is exactly one line through the point perpendicular to the given line |
| Reflextive Property | For any segment AB, segment AB is congruent to segment AB. for any angle A, angle A is congruent to angle A |
| Symmetric Property | If segment AB is congruent to segment CD, the segment CD is congruent to segment AB. If angle A is congruent to angle B, then angle B is congruent to angle A |
| Transitive Property | If segment AB is congruent is segment CD and segment CD is congruent to segment EF, then segment AB is congruent to segment EF. If angle A is congruent to angle B and angle B is congruent to angle C, then angle A is congruent to angle C |
| Right Angles Congruence Theorem | All right angles are congruent |
| Congruent Supplements Theorem | If two angles are supplementary to the same angles(or to congruent angles)then they are congruent |
| Congruent Complements Theorem | If two angles are complementary to the same angle ( or to congruent angles), then they are congruent |
| Vertical Angles Congruence Theorem | Vertical angles are congruent |
| Corresponding Angles Theorem | If two parallel lines are cut by a transversal, then the pairs of corresponding angles are congruent |
| Alternate Interior Angles Theorem | If two parallel lines are cut by a transversal , then the pairs of alternative interior angles are congruent |
| Alternate Exterior Angles Theorem | If two parallel lines are cut by a transversal , then the pair of alternate exterior angles are congruent |
| Consecutive Interior Angles Theorem | If two parallel lines are cut by a transversal, then the pair of consecutive interior angles are supplementary |
| Alternate Interior Angles Converse | If two lines are cut by a transversal so the alternate interior angles are congruent, then the line are parallel |
| Alternate Exterior Angles Converse | If two lines are cut by a transversal so the alternate exterior angles are congruent, then the lines are parallel |
| Consecutive Interior Angles Converse | If two lines are cut by a transversal so the consecutive interior angles are supplementary, then the lines are parallel |
| Transitive Property Of Parallel Lines | If two lines are parallel to the same line, then they are parallel to each other |
| Linear Pair Perpendicular Theorem | If two line intersect to from a linear pair of congruent angles, then the lines are perpendicular |
| Perpendicular transversal Theorem | In a plane, if a transversal is perpendicular to one of two parallel lines, then it is perpendicular to the other line |
| Lines Perpendicular To Transversal Theorem | In a plane, if two lines are perpendicular to the same line, then they are parallel to each other |
| Slopes Of Parallel Lines | In a coordinate plane, two distinct non-vertical lines are parallel if and only if they have the same slope . Any two vertical lines are parallel |
| Slopes Of Perpendicular Lines | In a coordinate plane, two non-vertical lines are perpendicular if and only if the product of their slopes is -1. Horizontal lines are perpendicular to vertical lines. |
| Corresponding Angles Converse | If two lines are cut by a transversal so the corresponding angles are congruent, then the lines are parallel |