The sum of two complementary angles is 90.
E.g. 30 degrees and 60 degrees are each others complementary angles.
The sum of two supplementary angles is 180.
E.g. 105 and 75 are each others supplementary angles.
Supplementary angles are those whose angles add up to 180 degrees. Complementary angles are those whose angles add up to 90 degrees.
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Complementary angles are 90 degree angles while supplementary angels are 180 degree angles.You remember it by how complementary angle are 90 degrees more to get a supplementary angles.
Complementary angles sum to 90o Supplementary angles sum to 180o
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Supplementary angles forms a 180o angle (or a straight line). Complementary angles form a 90o angle.
Complementary angles are found by subtracting a random angle from 90 degrees for complementary always and 180 for supplementary always