linear pair		consists of a point and all points on the line that extend in one direction
angle bisector		extends in one dimension
right angle		an angle with a measure between 90 and 180 degrees
Plane		an angle with a measure less than 90 degrees
parallel lines		rules that are accepted without proof
straight angle		an unrpoven statement that is based on observation
point		extends in 2 dimensions
conjecture		a ray that divides an angle into 2 adjacent angles that are congruent
segment bisector		a 90 degree angle
Line		the point that divides a segment into 2 congruent segments
segment		2 lines that intersect to form a right angle
Ray		a small dot with no dimension
Postulate		2 different rays that have the same point
Angle		2 angles whose sides form 2 pairs of opposite rays
midpoint		2 adjacent angles whose noncommon sides are opposite rays
vertical angles		and angle witha measure of 180 degrees
congruent angles		2 angles whose measure have the sume of 180 degrees
perpendiculer lines		part of line that consists of 2 points and all points between the endpoints
congruent segments		if C is between A and B, the CA and CB are opposite rays
supplementary angles		a segment, ray, line, or plane that intersects a segment at its midpoint
Acute angle		angles that have the same measure
opposite rays		segments that have the same length
obtuse angle		2 lines that never intersect
complementary angles		2 angles whose measure have the sum of 90 degrees