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Geometry Chapter 1 & 2
Vocabulary Terms from Chapter 1 and 2
32
Mathematics
10th Grade
12/12/2010

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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
Adjacent angles
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
Addition property
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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