degrees		an angle with a measure greater than 90 degrees and less than 180 degrees
perpendicular line		a specific location in space with no size or shape
congruent angles		a straight path
plane		two lines that intersect to form a right angle
supplementary angle		angles that have the same measure
protractor		an angle with a measure greater than 0 degrees and less than 90 degrees
point		the sum total of these angle measures is 180 degrees
skew line		unit of measurement for angles
straight angle		the sum total of these angle measures is 90 degrees
vertical angle		tool used to make linear measurements
ray		two lines with no point of intersection
right angle		the common endpoint of two rays that form an angle
adjacent angle		a portion of a line that extends from one point infinitely in one direction
vertex		an angle that measure 90 degrees
parallel line		opposite angles formed by the intersection of two lines
complementary angle		an angle with a measure of exactly 180 degrees
ruler		tool used to measure angles
angle		a flat surface with no edges or boundaries
acute angle		two angles that have a common side and the same vertex, but do no overlap
obtuse angle		two rays with a common endpoint
line		two lines that do not intersect and are not in the same plane
line segment		part of a line containing two endpoints and all points between the endpoints