document.write( "Question 791551: what is sin630?\r
\n" ); document.write( "\n" ); document.write( "Technically, it's on the 270 degree line (between 3rd & 4th quadrant)\r
\n" ); document.write( "\n" ); document.write( "Since it's on the y-intercept, wouldn't that made the triangle undefined?\r
\n" ); document.write( "\n" ); document.write( "I'm not too sure how this works, Please reply ASAP. Thank you. \n" ); document.write( "

Algebra.Com's Answer #479625 by KMST(5347) $\"\"$ $\"About$

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Trigonometric functions cosine and sine are defined as the x and y coordinates of the point where the second side of the angle intersect the unit circle (a circle of radius 1, centered at the origin).
\n" ); document.write( "The angles are placed on the standard position of the first side coinciding with the positive x-axis, and angles are measured as the counterclockwise turn from the first side to the final side.
\n" ); document.write( "If you turn the positive x-axis counterclockwise $\"1%263%2F4\"$ turns, that is a $\"360%5Eo%287%2F4%29=630%5Eo\"$ .
\n" ); document.write( "After that turn, the final side of the angle overlaps the negative y-axis, and intersects the unit circle at the point (0,-1), with $\"x=0\"$ , $\"y=-1\"$ , so $\"cos%28630%5Eo%29=0\"$ and $\"sin%28630%5Eo%29=-1\"$ . \n" ); document.write( "

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