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Sine and the cosine of the angle.
Sine ratio = opposite/hypotenuse
It is the Sine(Sin) ratio. Sin(angle) = o/h
sine(15 degrees) = 0.25882 (rounded)
This ratio is called the sine ratio for a right triangle. A simple way to remember this is by using the mnemonic 'SOHCAHTOA', where SOH stands for sine equals the ratio opposite side/ hypotenuse, COH is cosine equals adjacent side/hypotenuse, and TOA is tangent equals opposite side/adjacent side.