| A | B |
|---|
| parallel lines | Two lines that are coplanar and do not intersect. |
| skew lines | Two lines that do not intersect and are not coplanar. |
| parallel planes | two planes that do not intersect. |
| transversal | A line that intersects two or more coplanar lines at different points. |
| corresponding angles | Two angles that are formed by two lines and a transversal and occupy corresponding positions. |
| alternate interior angles | Two interior angles that are formed by two lines and a transversal and that lie between the two lines on opposite sides of the transversal |
| alternate exterior angles | Two angles that are formed by two lines and a transversal and that lie outside the two lines on opposite sides of the transversal |
| consecutive interior angles | Two angles that are formed by two lines and a transversal and that lie between the two lines on the same side of the transversal. |
| flow proof | A type of proof that uses arrows to show the flow of a logical argument. Statements are connected by arrows to show how each statement comes from the one before it, and each reason is written below the statement it justifies. |
