Answer to Question #4743 in Geometry for markavia
When two angles form a pair of complementary, supplementary and vertical angles, a very special relationship takes place between the measures of the two angles. Such a relationship may be useful in determining other unknown angles.
As you may know, two angles are complementary if the sum of their degree measures equals 90 degrees. Two angles, measuring 50 degrees and 40 degrees, are complementary because their sum is 90 degrees
These are similar to complementary angles, except their sum is 180 degrees. Often you will see supplementary angles created in a ray shoots out from a flat line
Vertical angles are opposite pairs of congruent (or equal) angles that are made when 2 lines intersect (cross at a point).
Hope this will help
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