###
vertex

the common endpoint of two rays that form an angle

###
linear

this describes a pair of adjacent angles whose noncommon sides are opposite rays

###
adjacent

this describes any two non-overlapping angles that share a common ray and a common vertex

###
obtuse

this describes an angle having a measure greater than 90 degrees and less than 180 degrees

###
side

this refers to one of the rays that form an angle

###
right

this describes an angle that has a measure of exactly 90 degrees

###
vertical

these are also called "opposite angles". They are nonadjacent angles formed by intersecting lines

###
complementary

this describes a pair of angles with combined measures that equal 90 degrees

###
supplementary

this describes a pair of angles with combined measures that equal 180 degrees

###
straight

this describes an angle that measures exactly 180 degrees

###
bisector

this refers to a point, line, or plane that divides a geometric figure into congruent halves

###
acute

this describes an angle having a measure greater than 0 degrees and less than 90 degrees

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