Geometry Postulates and Theorems

Front

a point not on a line, there is exactly one line perpendicular to the given line.

Back

*Front:* Perpendicular Postulate

Front

a point not on a line, there is exactly one line parallel to the given line.

Back

*Front:* Parallel Postulate

Front

two parallel lines are cut by a transversal, then corresponding angles are congruent.

Back

*Front:* Corresponding Angles Postulate

Front

two parallel lines are cut by a transversal, then alternate interior angles are congruent.

Back

*Front:* Alternate Interior Angles Theorem

Front

two parallel lines are cut by a transversal, then alternate exterior angles are congruent.

Back

*Front:* Alternate Exterior Angles Theorem

Front

two parallel lines are cut by a transversal, then consecutive interior angles are supplementary.

Back

*Front:* Consecutive Interior Angles Theorem

Front

two lines are perpendicular, they form four right angles.

Back

*Front:* Perpendicular Lines Theorem

Front

line that intersects two or more lines at different points.

Back

*Front:* Transversal

Front

opposite each other when two lines intersect; they are congruent.

Back

*Front:* Vertical Angles

Front

pair of adjacent angles whose non-common sides form a line; they are supplementary.

Back

*Front:* Linear Pair