Angles that are not next to each other.
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Are complementary angles alwys adjacent?
Rectangles have congruent adjacent angles.
A pair of adjacent angles whose non-common sides are opposite rays are called a linear pair. The measure of a straight angle is 180 degrees, so a linear pair of angles must add up to 180 degrees.
Two angles are adjacent if they have the same vertex, share a side and do not overlap. It is, therefore, perfectly possible for two obtuse angles to be adjacent. In fact, every pair of adjacent angles in a hexagonal tessellation (a honeycomb, for example), consists of a pair of obtuse angles (120 degrees).
Two adjacent angles are considered supplementary angles. They aggregate and make an angle that measures 180 degrees.