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{{ printedBook.courseTrack.name }} {{ printedBook.name }} The ratio between the lengths of the opposite side and the hypotenuse in a right triangle for a specific angle, $θ,$ is called the sine of $θ$ and is written $sin(θ).$

$sin(θ)=hypotenuseopposite $

The ratio is always the same for any given angle. If the hypotenuse is, for example, twice as long as the opposite side, the ratio is $sin(θ)=21 .$ This quotient holds true because the triangles are bound by similarity. Sine only states the **ratio** between the opposite side and the hypotenuse, it gives no indication about the lengths of the individual sides.