Sine, cosine, tangent
Sine, cosine, and tangent are ratios of a right triangle's sides relative to an acute angle: sine is opposite over hypotenuse, cosine is adjacent over hypotenuse, and tangent is opposite over adjacent. In a right triangle with an opposite side of 3, an adjacent side of 4, and a hypotenuse of 5, sine is 3/5, cosine is 4/5, and tangent is 3/4 for that angle. Because a right triangle's two acute angles are complementary (they add to 90 degrees), the sine of one angle always equals the cosine of the other.
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