# Trigonometry Triangle to Show Sine, Cosine, and Tangent

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Right triangle OCA, inside of Circle O is used to show that side AC is “opposite” O and side OC is “adjacent” to O. OA is the hypotenuse. Sine is defined as the ratio of the opposite side to the hypotenuse (AC/OA). Cosine is defined as the ratio of the adjacent side to the hypotenuse (OC/OA), and Tangent is defined as the ratio of the opposite side to the adjacent side (DB/OB).

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Trigonometry: Triangles### Source

International Correspondence Schools *I.C.S. Reference Library Mathematics* (Scranton: International Textbook Company, 1905) Geometry & Trigonometry Pg. 25

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