Sin is sin-1(opposite/hypotonose)
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The sine of an angle in a right triangle is opposite/hypotenuse, where opposite is the only side that is not adjacent to the angle you want to find the sine of, and the hypotenuse is the side opposite the right angle in the triangle. Just find opposite/hypotenuse.
Sine ratio = opposite/hypotenuse
For a right angle triangle:- hypotenuse = adjacent/cosine or hypotenuse = opposite/sine
Sine of an angle (in a right triangle) is the side opposite of the angle divided by the hypotenuse.
you need to have at least 2 values of the lengths of the triangle and then you can find the angle by sine, cosine or tangent formulas you may try this online calculator for right triangles. http://www.rillocenter.com/calculate/trigonometry.html