Geometry:Angles-classify and relationship
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linear pair
Two adjacent angles that form a straight line and are supplementary
straight angle
angle that measures exactly 180 degrees
right angle
angle that measures exactly 90 degrees
acute angle
angle that measures less than 90 degrees
obtuse angle
angle that measures more than 90 degrees but less than 180 degrees
supplementary angles
two angles whose measures have sum 180
complementary angles
two angles whose measures have sum 90
vertical angles
two angles whose sides form two pairs of opposite rays
adjacent angles
two coplanar angles with a common side , a common vertex, and no common interior points
