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Chapter1
Chapter 1 Vocab
19
Mathematics
9th Grade
09/10/2012

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Term
inductive reasoning
Definition
reasoning based on patterns you observe
Term
conjecture
Definition
conclusion you reach using inductive reasoning
Term
counterexample
Definition
to prove that a conjecture is false
an example for which the conjecture is incorrect
Term
point
Definition
(think of as location)
-no size
-represented by a dot and named by CAPITAL letter
Term
space
Definition
defined as set of all points
Term
line
Definition
series of points that extends in two opposite directions without end

can name a line by two points, can name a line with lower case letter
Term
collinear points
Definition
points that lie on same line
Term
plane
Definition
flat surface with no thickness
named by single capital letter or by at least 3 of its non collinear points
Term
coplaner
Definition
points and lines in the same place
Term
postulate
Definition
accepted statement of fact
Term
segment
Definition
part of a line consisting of two endpoints and all points between them
Term
ray
Definition
part of a line consisting of one endpoint and all points of the line on one side
Term
opposite rays
Definition
two collinear rays with same endpoint
Term
parallel lines
Definition
coplanar lines that do not intersect
Term
skew lines
Definition
are non coplanar, therefore they are NOT parallel and do NOT intersect
Term
parallel planes
Definition
are planes that do not intersect

line and plane that do not intersect are also parallel
Term
congruent segments
Definition
two segments with the same length
Term
midpoint
Definition
point that divides the segment into 2 congruent segments
Term
bisect
Definition
midpoint, line, ray or segment through a midpoint
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