alternate interior angles, corresponding angles, transversal
TEKS 8(1)(D), 8(1)(F), 8(1)(G), 8(8)(D)
A transversal is a line that intersects two or more lines at different points. In the diagram, line t is a transversal.
Corresponding angles lie on the same side of a transversal and in corresponding positions. There are four pairs of corresponding angles in this diagram: ∠1 and ∠5, ∠2 and ∠6, ∠3 and ∠7, and ∠4 and ∠8.
Alternate interior angles lie within a pair of lines and on opposite sides of a transversal. There are two pairs of alternate interior angles in this diagram: ∠3 and ∠5, and ∠4 and ∠6.