I need explanation on sine rule for 3rd quadrant

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asked Aug 23, 2019 30.2k views

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Methyl · Answer 1 · 2019-08-26T22:43:15+0000

Consider the unit circle. The sine of an angle is the y-value of the location of the terminal ray where it intersects the unit circle. In the third and fourth quadrants, the sine is negative, because all y-values are negative there.

I need explanation on sine rule for 3rd quadrant

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