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### 15 Cards in this Set

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 What does the term "complementary angles" mean? Two angles whose sum is 90 degrees. (They do not have to be adjacent) What does the term "supplementary angles" mean? Two angles whose sum is 180 degrees. (They do not have to be adjacent) What does it mean for two lines to be "perpendicular"? The two lines interesect to form 4 right (90 degree) angles. The slopes of perpendicular lines are opposite reciprocals of one another. Ex: 2 and -1/2 What are "vertical angles"? The nonadjacent angles formed by two intersecting lines. In other words, the opposite angles in an X. They are always congruent to each other. What is a "linear pair"? Two adjacent angles that make a line (add to 180 degrees). What are "adjacent angles"? Two angles that share a common side and a common endpoint but no common interior points. In other words, two angles touching right next to each other. What is a "polygon"? A closed figure with many sides. What do we know about "similar triangles"? Corresponding angles are congruent and corresponding sides are proportional. They are the same shape but different sizes. What are the five abbreviated postulates/theorems used to prove triangles congruent? SSS, SAS, ASA, AAS, and HL. What is the interior angle sum of a triangle? 180 degrees What is the total of all central angles in a circle? 360 degrees What is the interior angle sum of a quadrilateral? 360 degrees What is a dodecagon? A 12-sided figure What is an "altitude" of a triangle? The segment that comes from an angle and is perpendicular to the opposite side (makes a right angle with the side). Also called the "height". What do we call a figure with four congruent sides but not necessarily four congruent angles? Rhombus