Math-Classify and measure angles-unit 6
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straight angle
an angle that measures exactly 180
right angle
an angle that measures exactly 90
acute angle
an angle that measures more than 0 but less than 90
obtuse angles
an angle that measures more than 90 but less than 180
vertical angles
angles that are opposite from one another at the intersection of two line; vertical angles are congruent
vertex
the point where two lines segments, lines, or rays meet to form an angle
adjacent angles
two angles that have a common vertex and side but are not overlapping
supplementary angles
two angles whose sum is 180
complementary angles
two angles whose sum is 90
