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20 Cards in this Set
 Front
 Back
segment addition postulate

if B is between A and C then
AB+BC=AC 

congruent segment

two or more segments of equal length


midpoint of a segment

the point that divides the segment into two congruent segments


bisector of a segment

a line, segment, ray, or plane that intersects the segment at its midpoint


angle

the figure formed by two rays that have the same endpoint


congruent angles

two or more angles that have equal measures


angle addition postulate

m<ECA+m<ACB=M<ECB


angle bisector

a ray that divides an angle into two congruent adjacent angles


adjacent angles

two angles in a plane that share a common vertex and a common side but no common interior points


complimentary angles

two angles with measures that total 90


supplementary angles

two angles with measures that total 180


vertical angles

two angles such that the sides of one angle are opposite rays to the sides of the other angle


linear pair

two adjacent angles such that their unshared sides are opposite rays


postulate

a line contains at least two points


postulate

through any two points there is exactly one line


theorem

if two lines intersect then they intersect in exactly one point


postulate

a plane contains at least 3 noncollinear points


postulate

through any three noncollinear points there is exactly one plane


postulate

if two points are in a plane then the line that contains the points is in that plane


postulate

if two planes intersect then their intersection is a line
