Vertical Angles Definition/Description Theorems/Postulates Looks like Example Looks like Example (Vertical Angle Theorem) Vertical angles are always __________________. Linear Pair Definition/Description Theorems/Postulates If 2 angles form a linear pair, then they _________________________________________________ Corresponding Angles Definition/Description Theorems/Postulates Looks like Example Looks like Example (Corresponding Angle Postulate) Corresponding angles are ______________________ if and only if 2 lines are parallel. Alternate Interior Angles Definition/Description Theorems/Postulates (Alternate Interior Angle Theorem) Alternate interior angles are _________________ if and only if 2 lines are parallel. Alternate Exterior Angles Definition/Description Theorems/Postulates Looks like Example (Alternate Exterior Angle Theorem) Alternate exterior angles are _________________ if and only if 2 lines are parallel. Same Side Interior/ Exterior Angles Definition/Description Theorems/Postulates (Same side interior/ Exterior Angle Theorem) Same side interior/ exterior angles are ___________________________________ if and only if 2 lines are parallel. Looks like Example