or Ratio, is when the greater term contains the less term once, and leaves some number greater than 1 remaining. As the ratio of 3 to 5, which is equal to that of 1 to 1½; of 7 to 10, which is equal to that of 1 to 1½; &c.

SUPPLEMENT, of an Arch or Angle, in geometry or trigonometry, is what it wants of a semicircle, or of 180°; as the complement is what it wants of a quadrant, or of 90°. So, the supplement of 30° is 150°; as the complement of it is 60°.