Classify and Measure angles
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806
Unit 6
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 angle
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 lines; vertical angles are congruent
vertex
the point where two line 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°