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Postulates/Theorems
help to remember them
21
Mathematics
9th Grade
10/19/2011

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Term
ruler postulate
Definition
segments can be measured
Term
segment addition postulate
Definition
if b is between a and c, then ab+bc=ac
Term
protractor postualte
Definition
angles can be measured
Term
angle addition postulate
Definition
angle can be added
Term
a line contains at least 2 points
Definition
Term
a plane contains at least 3 noncollinear points
Definition
Term
space contains at least 4 noncollinear points
Definition
Term
through any 2 points there is exactly one line
Definition
Term
through any 3 points there is at least one plane
Definition
through any 3 noncollinear points, there is exactly one plane
Term
if 2 points are in a plane, then the line that contains the points is in that plane
Definition
Term
if two planes intersect, then their intersection is a line
Definition
Term
if 2 lines intersect, then they intersect at one point
Definition
Term
through a line and a point not on the line there is one plane
Definition
Term
if 2 lines intersect, then one plane contains the line
Definition
Term
conditional statement
Definition
if p, then q
Term
converse conditional statement
Definition
if q, then p
Term
inverse conditional statement
Definition
if not p, then not q
Term
contrapositive conditional statement
Definition
if not q, then not p
Term
defintion of midpoint
Definition
the point that divides the segment into two congruent segments
Term
defintion of midpoint
Definition
the point that divides the segment into two congruent segments
Term
midpoint theorem
Definition
if m is the midpoint of segment AB then segment AM=1/2 segment AB and segment MB=1/2 segment AB
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