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Chapter 2
Vocab
12
Mathematics
9th Grade
09/05/2008

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Term
midpoint
Definition
The point on the segment line that divides it into two congruent segments
Term
segment bisector
Definition
A segment, ray, line, or plane that intersects a segment at its midpoint.
Term
bisect
Definition
To divide a segment into two congruent segments.
Term
angle bisector
Definition
A ray that divides an angle into two angles that are congruent.
Term
complementary angles
Definition
Two angles with a sum of their measures at 90 degrees.
Term
supplementary angles
Definition
Tow angles with a sum of their measures at 180 degrees.
Term
adjacent angles
Definition
Two angles that share a common vertex and side, but have no common interior points.
Term
theorem
Definition
True statements that follow from other true statements.
Term
vertical angles
Definition
Two angles that are not adjacent and their sides are formed by two intersecting lines.
Term
linear pair
Definition
Two adjacent angles that have noncommon sides on the same line.
Term
if-then statement
Definition
Has two parts. The "if" part contains the hypothesis. The "then" part contains the conclusion.
Term
deductive reasoning
Definition
Uses facts, definitions, accepted properties, and the lsws of logic to make a logical arguement.
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