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It is simply the sine of the supplementary angle.

If x is an angle measuring (90, 180) degrees, then

sin(x) = sin(180 - x).

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Q: What is the sine ratio of obtuse angles?
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The sine of one of the acute angles in a right triangle is the ratio of the length of the side opposite the angle to the length of the hypotenuse.


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What is the sine of 50 degrees in radians?

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Because they are obtuse angles!


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