Classifying Angles
vertex
A point where two or more straight lines meet.
vertical angles
Angles opposite one another at the intersection of two lines.
adjacent angles
Angles that have a common side and a common vertex (corner point).
congruent angles
Angles that have the same measure
supplementary angles
Angles whose measure adds up to 180 degrees.
complementary angles
Angles whose measure adds up to 90 degrees.
Perpendicular lines
Two lines that intersect at a right angle
obtuse angle
angle that is >90 degrees and <180 degrees.
straight angle
angle that measures exactly 180 degrees.
right angle
angle that measures exactly 90 degrees.
acute angle
angles whose measure is >0 degrees and <90 degrees
linear pair
two angles that are adjacent and supplementary. They form a straight line.