*Note: This is more of a review for myself...*

When two

**parallel**lines are cut by a transversal line, eight angles will be formed, like this:

In such a situation, you can identify four types of angle pairings: alternate exterior angles, alternate interior angles, corresponding angles, and same-side interior angles.

__Alternate Exterior Angles__1 and 8 are also alternate exterior angles |

**equal**to each other.

__Alternate Interior Angles (Z-pattern)__

4 and 5 also form the z-pattern |

**equal**to each other.

__Corresponding Angles (F-pattern)__(2,6), (3,7) and (1,5) also form the f-pattern |

**equal**to each other.

__Same-Side Interior (C-pattern)__

3 and 5 also form c-pattern |

**supplementary**(they add up to 180 degrees).

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Yes... that's it. Not much explanation.