intersection		the extent or amount of space between two things, points, lines,
ray		a rule that is accepted without proof
endpoint		sides that form two points of opposite rays
coplanar		all sides are congruent
collinear		a line that has only one endpoint
postulate		points that lie in the same plane
coordinate		all angles in the interior of the polygon are congruent
distance		coinciding at all points when superimposed
congruent		the opposite of convex
segment		having a surface that is curved or rounded outward.
bisect		a part cut off from a figure
midpoint		any of the magnitudes that serve to define the position of a point, or line
angle		points that lie on the same line
vertex		measures 180 degrees
complementary angle		a line that divides two point eaqualy
supplementary angle		measures 90 degrees
adjacent angles		two different rays with the same endpoints
vertical angles		a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end.
polygon		a point that ends a line
convex		a plane closed figure with
concave		a point of a segment that divides the segment into two congruent segments
equilateral polygon		a line that is half of the diameter
equiangular polygon		two angles that share a common vertex and side, but have no common interior points
diameter		a point or set of points common to two or more geometric configurations
radius		the endpoint of a side