, of an arch, or angle, in Geometry or Trigonometry, is what it wants of a semicircle, or of 180 degrees; as the complement is what it wants of a quadrant, or of 90 degrees. So, the Supplement of 50° is 130°; as the complement of it is 40°.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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