Parallel Lines & Transversals

By bnl008
  • Complementary Angles

    Complementary Angles

    These angles have a sum of 90°. They form a right angle.
  • Supplementary Angles

    Supplementary Angles

    These angles have a sum of 180°. They form a straight line.
  • Vertical Angles

    Vertical Angles

    These angles are opposite of each other in the same intersection. They share the same vertex. They are congruent.
  • Corresponding Angles

    Corresponding Angles

    These angles are in the same position in different intersections. If you translated one intersection to the other, the angles would correspond. They are congruent.
  • Alternate Exterior Angles

    Alternate Exterior Angles

    The pairs of angles located outside the parallel lines (exterior) and on opposite sides (alternate) of the transversal. These angles are congruent.
  • Alternate Interior Angles

    Alternate Interior Angles

    The pairs of angles located inside the parallel lines (interior) and on opposite sides (alternate) of the transversal. These angles are congruent.
  • Same Side Exterior Angles

    Same Side Exterior Angles

    The pairs of angles located outside the parallel lines (exterior) and on the same side of the transversal. These angles are supplementary (they have a sum of 180°).
  • Same Side Interior Angles

    Same Side Interior Angles

    The pairs of angles located inside the parallel lines (interior) and on the same side of the transversal. These angles are supplementary (they have a sum of 180°).