U2 Geometry

never thought I'd need flashcards for freaking math but here we are... :')

adjacent angles

two angles that share a common side and vertex (“next to” each other)

vertical angles

two angles directly across from each other on intersecting lines

complementary angles

two angles with measures that sum to 90 degrees

supplementary angles

two angles with measures that sum to 180 degrees (do NOT have to be adjacent)

alternate exterior

angles in opposite sides of the transversal and on the outside of the parallel lines (CONGRUENT)

same side exterior

angles on the same side of the transversal and on the outside of the parallel lines (SUPPLEMENTARY)

linear pair

angles that are next to each other (SUPPLEMENTARY)

corresponding angles

angles on the same side of the transversal and in the same position (CONGRUENT)

alternate interior

angles on the opposite sides of the transversal and on the inside of the parallel lines

same side interior

angles on the same side of the transversal and on the inside of the parallel lines

reflexive property of equality

any # is equal to itself

transitive property of equality

if I’m the same as Ethan, and Ethan’s the same as Christopher, then I’m the same as Christopher

exterior angle theorem

an exterior is always equal to the sum of the two non-adjacent angles