PARALLEL LINES & TRANSVERSALS • PARALLEL LINES ARE LINES THAT WILL NEVER MEET, CROSS PATHS OR INTERSECT • A TRANSVERSAL IS A LINE THAT PASSES THROUGH TWO LINES IN THE SAME PLANE AT TWO DISTINCT POINTS

TODAY WE WILL BE DISCUSSING WHAT HAPPENS WHEN TWO PARALLEL LINES ARE CUT BY A TRANSVERSAL…

VERTICAL ANGLES • Opposite angles made by two intersecting lines • Angles that are back-toback • Congruent in measure

ADJACENT ANGLES • Angles with a common side • Common vertex • Do not Overlap • When two angles are cut by a transversal, adjacent angles are supplementary

SAME-SIDE INTERIOR ANGLES • ANGLES THAT ARE ON THE SAME SIDE OF THE TRANSVERSAL • INSIDE THE PARALLEL LINES • THESE ANGLES ARE SUPPLEMENTARY

SAME-SIDE EXTERIOR ANGLES • ANGLES THAT ARE ON THE SAME SIDE OF THE TRANSVERSAL • OUTSIDE THE PARALLEL LINES • THESE ANGLES ARE SUPPLEMENTARY

ALTERNATE INTERIOR ANGLES • Angles that are on the opposite side of the transversal • Both are inside the parallel lines • NOT adjacent • Angles are congruent in measure

ALTERNATE EXTERIOR ANGLES • Angles that are on the opposite side of the transversal • NOT adjacent • Both are outside the parallel lines • Angles are congruent in measure

CORRESPONDING ANGLES • Same side of the transversal • NOT adjacent (side by side) • NOT Consecutive (following continuously) • “Pick one, Skip One”