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32 Cards in this Set
 Front
 Back
point

no size
represented by a dot has location 

line

collection of points going in opposite directions
no thickness one dimensional 

Plane

flat surface
goes on forever in all directions 2 dimensional has no bounds need at least 3 points to name it 

Space

collection of all points


Collinear points

points that are on the same line


noncollinear points

points that are not on the same line
need at least 3 points to be noncollinear 

coplanar points

points in the same plane


noncoplanar points

points not on the same plane
need at least 4 points to be noncoplanar 

segment

section of a line with 2 end points


ray

section of a line with one endpoint and all points extending in one direction from the endpoint


opposite rays

rays with the same endpoint headed in opposite directions


congruent segment

segments with the same length


midpoint of a segment

divides the segment into two congruent segments


bisector of a segment

a line, ray, segment, or a plane that goes through the midpoint of a segment.


angle

a figure formed by two rays that have the same endpoint


acute angle

between 0º and 90º


right angle

90º


obtuse angle

between 90º and 180º


adjacent angles

angles with a common vertex and a common side
one is NOT inside the other 

bisector of an angle

a ray that divides an angle into two congruent angles


perpendicular lines

two lines that form right ∠'s


vertical ∠'s

2 ∠'s whose sides form two pairs of opposite rays


complementary ∠'s

2 ∠'s whose sum is 90º


supplementary ∠'s

2 ∠'s whose sum is 180º


Parallel lines

coplanar lines that do not intersect


skew lines

noncoplanar lines that do not intersect


parallel planes

planes that do not intersect


transversal

a line that intersects two or more coplanar lines


corresponding ∠'s (corr ∠'s)

tow ∠'s in corresponding positions


alternate interior ∠'s (AIA's)

2 nonadjacent interior ∠'s on oppposite sides of a transversal


alternate exterior ∠'s (AEA's)

outside opposites


SameSide Interior ∠'s (SII's)

∠'s on the same side of the transversal within the two lines
