## Geometry Theorems and Postulates for a Midterm

DEFINITIONS?Def. line segment (segment) - part of a line that has 2 definite endpoints?Def. ray - part of a line that starts with a definite endpoint and extends indefinitely in 1 direction?Def. angle - the union of 2 noncollinear rays with a common endpoint?Def. union - elements belonging in 1 or both sets?Def. intersection - elements that belong to both sets?Def. absolute value - |x| = if x _>_ 0; -x if x _<_ 0?Def. segment length - the distance between the endpoints?Def. congruent segments - segments with the same length?Def. midpoint - a point B is called the midpoint of lineAC if A - B - C and AB = BC?Def. segment bisector - a point, line, ray, segment, or plane that passes through the midpoint of a line?Def.