Use the diagram shown. Identify all pairs of the specified angles.
In the quadrilateral, and form a complementary angle pair.
The figure is shown below.
If the sum of two angles is then the angles are called complementary angles and if the sum is then the angles are called supplementary angles.
The sum of measures of all the possible pairs of angles in the quadrilateral is,
In the above list, only the pair have the sum of their measures equal to .
The pair of complementary angles in the quadrilateral is .
Extended Problem Solving: In the bicycle frame shown, is called the head angle, and is called the seat angle. Lines and are parallel.
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