Every circle is equal to 360 degrees. The radians are coterminal to the degrees. For instance, 360 degrees is 2pi and 180 degrees is just pi, 90 degrees is pi/2 and 270 degrees is 3pi/2. Any number, radian, or coordinates between 0, 360 and 90 degrees is in the first quadrant. Anything in between 90 and 180 degrees is in the second quadrant. Anything between 180 and 270 degrees is in the third quadrant, and anything between 270 and 360 is in the fourth quadrant. There are only 4 quadrants in the circle. To find the the cosine of a degree, you take the coordinates of that degree and the x coordinate will be the cosine. To find the sine of a degree, you take the coordinates of that degree and the y coordinate is the sine of that degree. To find the tangent of a degree you would take the coordinates, where the x equals the cosine and y equals the sine, then you divide the sine by the cosine to get tangent. To find what is coterminal to the angle, you can add or subtract 360. Also, 2(360) and -2(360) and so on.
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April 2015
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