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Geometry Chapter 1 & 2
Vocabulary Terms from Chapter 1 and 2
32
Mathematics
12/12/2010

Term
 Inductive Reasoning
Definition
 Is reasoning that is based on patterns you observe.
Term
 Conjecture
Definition
 Is a conclusion you reach using inductive reasoning.
Term
 Counterexample
Definition
 Is an example which a conjecture is incorrect.
Term
 Point
Definition
 Is a location has no size and is named by a capital letter.
Term
 Space
Definition
 Is defined as the set of all the points.
Term
 Line
Definition
 Is a series of points that extends in two opposite directions without end.
Term
 Collinear points
Definition
 Are points that lie on the same line.
Term
 Plane
Definition
 Is a flat surface that has no thickness.
Term
 Coplanar
Definition
 Points and lines in the same plane.
Term
 Angle
Definition
 Is formed by two rays with the same endpoint the rays are the sides of the angle and the end point is the vertex of the angle.
Term
 Acute angle
Definition
 A measurement between 0 degrees and 90 degrees.
Term
 Right angle
Definition
 A measurement of exactly 90 degrees.
Term
 Obtuse angle
Definition
 A measurement between 90 degrees and 180 degrees.
Term
 Straight angle
Definition
 A measurement of exactly 180 degrees.
Term
 Congruent angles
Definition
 Are two angles with the same measure.
Term
 Vertical angles
Definition
 Two angles whose sides are opposite rays.
Term
Definition
 Two coplanar angles with a common side, a vertex, and no common interior points.
Term
 Complementary angles
Definition
 Two angles whose measures have sum of 90 degrees.
Term
 Supplementary angles
Definition
 Two angles whose measures have sum of 180 degrees.
Term
 Perpendicular lines
Definition
 Are two lines that intersect to form right angles.
Term
 Perpendicular bisector of a segment
Definition
 Is a line segment or ray that is perpendicular to the segment at its midpoint there by bisecting the segment into two congruent segments.
Term
 Angle bisector
Definition
 Is a ray that divides an angle into two congruent coplanar angles.
Term
Definition
 If a = b, then a + c = b + c.
Term
 Subtraction property
Definition
 If a = b, then a - c = b - c.
Term
 Multiplication property
Definition
 If a = b, then a * c = b * c.
Term
 Division property
Definition
 If a = b and c is not equal to 0, then a/c = b/c.
Term
 Reflexive property
Definition
 a = a.
Term
 Symmetric property
Definition
 If a = b, then b = a.
Term
 Transitive property
Definition
 If a = b and b = c, then a = c.
Term
 Substitution property
Definition
 If a = b, then b can replace a in any expression.
Term
 Distribute property
Definition
 a(b+c) = ab + ac.
Term
 Theorem
Definition
 The statement that you prove true.
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