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.
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If the noncommon sides of two adjacent angles form a right angle, then the angles are complementary angles.
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A quadrilateral with 4 right angles and opposite sides that are parallel can be either a rectangle if the adjacent sides are of different length or a square if the adjacent sides are of the same length.
linear pair
All quadrilaterals apart from rectangles. Even parallelograms have adjacent angles that are not equal.