| A | B |
|---|
| parallel lines | coplanar lines that never intersect |
| skew lines | non coplanar lines that never intersect |
| parallel planes | planes that never intersect |
| transversal | a line which is coplanar with two lines and intersect those two lines in two different points |
| corresponding angles | one interior and one exterior angle that are non adjacent and are on the same side of the transversal |
| alternate interior angles | two angles are alternate interior angles if 1)both interior 2)non-adjacent 3)on opposite sides of the transversal |
| alternate exterior angles | two angles are alternate exterior angles if 1)both exterior 2)opposite sides of the transversal |
| same side interior angles | 1)both interior 2)same side of the transversal |
| slope of a line | a property of a line which tells us 1)how steep the line is 2)whether it's uphill or downhill as you move left to right |
| horizontal lines | lines that have a splope of zero |
| vertical lines | lines that have an undefined slope or no slope |
