Complementary angles sum to 90o
Supplementary angles sum to 180o
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It is always true because two congruent angles that are complementary both measure 45 degrees.
Supplementary Angles are two angles that add up to 180 degrees. Often you can find them on a straight line, however, they don't always have to be together. There is a related link that can help explain.
Floating
From any term after the first, subtract the preceding term.
Ask your teacher to explain again the difference between area and length...