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Lines and Angles

transversals and parallel lines

Transversal Line intersecting parallel lines
corresponding angles angles in the same relative position or "matching corners" and they are congruent
vertical angles pairs of opposite angles formed by intersecting lines that are congruent
straight angles angles that form a straight line and add up to 180 degrees (supplementary)
alternate interior angles angles inside the parallel lines and on opposite sides of the transversal. They are congruent.
alternate exterior angles angles outside the parallel lines and on opposite sides of the transversal. They are congruent.
acute angle angles that measure less than 90 degrees
obtuse angle angles that measure greater than 90 degrees
congruent angles angles that have the same angle measurement in degrees.
supplementary angles two angles whose sum is 180 degrees
complementary angles angles whose sum is 90 degrees
parallel lines two lines that are always the same distance apart and never touch
Created by: diannemcclernan