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Geometry Midterm Vocab
n/a
32
Mathematics
9th Grade
01/09/2011

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Term
Parallel Lines
Definition
Coplanar lines that do not intersect.
Term
Congruent Triangles
Definition
Triangles with the same size and shape.
Term
Isosceles Triangle
Definition
A triangle with at least 2 sides congruent.
Term
Remote Interior Angles
Definition
The angles of a triangle that are not adjacent to a given exterior angle.
Term
Transversal
Definition
A line that intersects two or more lines in a plane at different points.
Term
Skew Lines
Definition
Lines that do not intersect and are not coplanar.
Term
Corollary
Definition
A statement that can be easily proved using a theorem.
Term
Truth Value
Definition
The truth or falsity of a statement.
Term
Theorem
Definition
A statement that is proven true.
Term
Postulate
Definition
A statement that is accepted as true.
Term
Negation
Definition
Opposite meaning of original statement.
“Not” ~
Term
Inverse
Definition
Negate the hypothesis and conclusion.
Term
Inductive Reasoning
Definition
Reasoning that uses specific examples to arrive at a conjecture.
Term
Deductive Reasoning
Definition
Uses laws to arrive at a conclusion.
Term
Counterexample
Definition
Example that proves a conjecture false.
Term
Converse
Definition
Switch the hypothesis and conclusion.
Term
Contrapositive
Definition
Negate and switch the hypothesis and conclusion.
Term
Conditional Statement
Definition
A statement that can be written in “if-then” form.
Term
Conjecture
Definition
An educated guess based on known information.
Term
Vertical Angles
Definition
Two nonadjacent angles formed by two intersecting lines.
Term
Supplementary Angles
Definition
Two angles with measures that have a sum of 180.
Term
Segment Bisector
Definition
A segment, line, or plane that intersects a segment at its midpoint.
Term
Regular Polygon
Definition
A CONVEX polygon in which all of the sides and angles are congruent.
Term
Perpendicular
Definition
Lines that form right angles.
Term
Midpoint
Definition
The point halfway between the endpoints of a segment.
Term
Linear Pair
Definition
A pair of adjacent angles whose non-common sides are opposite rays.
Term
Line Segment
Definition
Has two endpoints, is finite.
Term
Complementary Angles
Definition
Two angles with measure that have a sum of 90.
Term
Coplanar
Definition
Points that lie in the same plane.
Term
Collinear
Definition
Points that lie on the same line.
Term
Angle Bisector
Definition
A ray that divides an angle into two congruent angles.
Term
Adjacent Angles
Definition
Two angles that share a common side and vertex but don’t overlap.
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