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Old 07-26-2007   #5
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In a right triangle, the sine of an angle (abbreviated SIN) represents a ratio between the lengths of the side opposite of the angle and the hypotenuse of triangle.Ex. In a standard 3, 4, 5 right triangle, the 2 legs are length 3 and 4, while the hypotenuse (always the longest side) is 5. So, the sine of one angle will be 3/5 and the sine of the other angle will be 4/5. The sine of the 90° right angle, since the opposite side and the hypotenuse are the same side, would be 5/5 = 1.And yes, you will use this in calculus! Good luck!