Theorem 6.6
Lines parallel to the same line are parallel to each other.
Key: If m ∥ l and n ∥ l, then m ∥ n
Key: If m ∥ l and n ∥ l, then m ∥ n
Corresponding Angles
When lines are parallel, corresponding angles are equal.
Key: ∠1 = ∠2 = ∠3
Key: ∠1 = ∠2 = ∠3
Transversal
A line that intersects two or more lines.
Key: Creates corresponding and alternate angles
Key: Creates corresponding and alternate angles
Auxiliary Lines
Helper lines drawn to solve problems.
Key: Construct parallel lines through key points
Key: Construct parallel lines through key points
Angle Relationships
Interior angles on same side sum to 180°.
Key: ∠1 + ∠2 = 180°
Key: ∠1 + ∠2 = 180°