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29 Cards in this Set

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 Reasoning that is based on patterns you observe. If you observe a pattern in a sequence, you can use inductive reasoning to tell what the next terms in the sequence will be. inductive reasoning A conclusion you reach using inductive reasoning. conjecture A particular example or instance of the statement that makes the statement false. counterexample Ex. Statement: If the name of a state begins with a W, then that state does not border on an ocean Countrexample: Washington Represented by a small dot on a line and is named by a capital letter Point Defined as the set of all points. Space A series of points that extends in two opposite directions without end. line Points that lie on the same line are collinear points A flat surface that has no thickness. Contains many lines and extends without end in the directions of all its lines. plane Points and lines in the same plane coplanar An accepted statment of fact postulate or axiom The part of a line consisting of two endpoints and all points between them. segment The part of a line consisting of one endpoint and all the points of the line on one side of the endpoint. ray Two collinear rays with the same endpoint. They always form a line. opposite rays Coplanar lines that do not intersect parallell lines Noncoplanar, they are not parallel and do not intersent skew lines Two segments with the same length congruent segments (=) The point that divides a segment into two congruent segments midpoint Formed by two rays with the same endpoint angle Angle that is less that 90 degrees acute angle Angle that is 90 degrees right angle Angle that is less than 180 degrees obtuse angle Angle that is 180 degrees straight angle Angles with the same measure congruent angles A straight edge and a compass to draw a geometric figure. construction A geometric tool used to draw circles and parts of circles called arcs. compass Two lines that intersect to form rights ancles. perpendicular lines A line, segment, or ray that is perpendicular to the segment at its midpoint, therby bisecting the segment into two congruent segments perpendicular bisector A ruler with no markings on it. straight edge A ray that divides an angle into two congruent coplanar angles. angle bisector