A location that has no size
Point
A straight 180 degree angle
Line
A flat surface
Plane
Part of a line that starts at an end point and extends forever in one direction
Ray
90 degree angle
Right angle
An angle that measures greater than 0 degrees and less than 90 degrees
Acute angle
An angle that measures greater than 90 degrees but less than 180 degrees
Obtuse angle
Two angles whose measures have a sum of 90 degrees
Complementary angles
Two angles whose measures have a sum of 180 degrees
Supplementary angles
Having the same size and shape
Congruent
The point that divides a segment into two congruent segments
Midpoint
Points that lie on the same straight line
Collinear points
Lines that do not lie on the same surface or plane
non coplanar
An angle of 180 degrees
Straight angle
have the same angle
Congruent angles
are simply line segments that are equal in length
Congruent segments
is a pair of adjacent, supplementary angles
Linear pair
lines in a plane which do not meet
Parallel planes
are two lines that do not intersect and are not parallel.
Skew lines
each of the parts into which something is or may be divided
Segment
lines that lie on the same plane.
Coplanar lines
Points that do not all lie on a single line.
Noncollinear points