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180º Finish this sentence: "Angles in a triangle add to . . ." Acute Angle An angle that measures between 0 and 90 degrees Adjacent Angles What do we call angles that share a common ray but no common interior points Angle Addition Postulate If a point S lies in the interior of ∠PQR, then ∠PQS + ∠SQR = ∠PQR. Angle Bisector cuts an angle into two equal parts Collinear Points that lie on the same line Complimentary angles Two angles that add to 90º are called Conditional Statement A statement that can be written in if-then form. Congruent Figures that have the same size and shape. Conjecture A statement you believe to be true based on inductive reasoning Converse Exchange the hypothesis and conclusion Coplanar points that lie on the same plane Counterexample An example that proves a statement false Deductive reasoning the process of using facts, properties, or rules to justify reasoning or reach valid conclusions Inductive reasoning The process of reasoning that a rule or statement is true because specific cases are true Linear Pair A pair of adjacent angles whose noncommon sides are opposite rays. Midpoint A point that divides the segment into two congruent segments. Obtuse Angle An angle that measures more than 90 degrees but less than 180 degrees. Postulates Statements that are accepted without proof Ray A part of a line, with one endpoint, that continues without end in one direction. Right angle An angle of 90º is called a Segment Addition Postulate If B is between A and C, then AB+BC=AC Straight angle An angle that measures 180º is called a Supplementary angles Two angles that add to 180º are called Vertex The corner (point) of an angle where the two rays meet Vertical Angles A pair of opposite congruent angles formed by intersecting lines