7-2, Angles and Parallel Lines (8.G.1, 8.G.2, and 8.G.3)
A line that intersects two other lines at different points is a transversal.
Corresponding angles lie on the same side of the transversal and in corresponding positions.
Alternate interior angles lie within a pair of lines and on opposite sides of the transversal.
KEY CONCEPTS: Transversals and Parallel Lines
When a transversal intersects two parallel lines,
Corresponding angles lie on the same side of the transversal and in corresponding positions.
Alternate interior angles lie within a pair of lines and on opposite sides of the transversal.
KEY CONCEPTS: Transversals and Parallel Lines
When a transversal intersects two parallel lines,
- corresponding angles are congruent, and
- alternate interior angles are congruent.