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The sine of an acute angle in a right triangle is equal to the ratio (length of opposite side)/(length of hypotenuse). The hypotenuse of a right triangle is the longest side, and is opposite of the right angle.

This may help you remember it:

Sin Cos Tan

O H A H O A. O means Opposite. A means Adjacent, and H means Hypotenuse.

Oh Heck Another Hour Of Algebra.

So Sin(Θ) = O/H ; Cos(Θ) = A/H ; and Tan(Θ) = O/A

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Q: What is the sin of angle a in a right triangle?
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