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What is the definition of "sine?"

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Quick Answer

In math, the sine of an angle is defined as the length of the side of a right triangle opposite the acute angle divided by the length of the hypotenuse. The lengths of these sides can be determined through the Pythagorean Theorem.

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Full Answer

Sine is a trigonometric function related to the functions cosine and tangent. Cosine is the opposite of sine in that it is equal to the length of the side of a right triangle adjacent to the acute angle divided by the length of the hypotenuse. The related tangent function is defined as the sine divided by the cosine.

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