the common endpoint of two rays that form an angle
this describes a pair of adjacent angles whose noncommon sides are opposite rays
this describes any two non-overlapping angles that share a common ray and a common vertex
this describes an angle having a measure greater than 90 degrees and less than 180 degrees
this refers to one of the rays that form an angle
this describes an angle that has a measure of exactly 90 degrees
these are also called "opposite angles". They are nonadjacent angles formed by intersecting lines
this describes a pair of angles with combined measures that equal 90 degrees
this describes a pair of angles with combined measures that equal 180 degrees
this describes an angle that measures exactly 180 degrees
this refers to a point, line, or plane that divides a geometric figure into congruent halves
this describes an angle having a measure greater than 0 degrees and less than 90 degrees
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