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31 Cards in this Set
 Front
 Back
Point 
no size, no dimension
represented by a dot 

Line 
one dimension represented by a line with 2 arrowheads 

Plane 
two dimensions flat surface extends in all directions named by at least 3 points 

Line Segment 
two endpoints 

Ray 
part of a line with one endpoint 

opposite rays 
same endpoint opposite directions 

collinear 
two points on same line 

coplanar points 
2 points on same


Postulate 
a statement that is accepted without proof 

Theorem 
a rule that must be proved true 

ruler postulate 
allow you to measure in the length of segments 

Segment Addition Postulate 
If B is between A and C then AB+BC=AC If AB+BC=AC then B is between A and C. 

Congruent Segments 
have equal length 

Midpoint 
divides a segment into two congruent segments 

Segment Bisector 
a line, ray, or segment that intersects a seg at its midpoint 

Angle 
consists of two rays with a common endpoint 

Protractor Postulate 
allows us to measure the size of angles in degrees 

Angle Addition Postulate 
if P is on the interior of Angle ABC, then the measure of angle ABP+the measure of angle PBC= the measure of angle ABC 

Congruent Angles 
have equal measure 

Angle Bisector 
a ray that divides an angle into 2 congruent angles 

Complementary Angles 
a pair of angles whose sum is 90 

Supplementary Angles 
a pair of angles whose sum is 180 

Adjacent Angles 
A pair of angles that share a vertex on the side but have no common interior points 

Linear Pair 
two adjacent angles are a linear pair if their non common sides form opposite rays 

Linear Pair Postulate 
angles in a linear pair are supplementary 

Vertical Angles 
2 angles are vertical angles if their sides form two pairs of opposite rays 

Polygon 
Formed by 3 or more sides and each side intersects exactly two other sides, one at each endpoint, no 2 sides with a common endpoint are collinear 

Convex 
no line that contains a side goes through the interior of the polygon 

Equilateral polygon 
all sides are congruent


Equiangular 
all angles are congruent 

Regular Polygon 
both equilateral and equiangular 