<span>There are 2*pi radians in a full turn so 360 degrees = 2*pi radians </span> <span>180 degress = pi radians </span> <span>90 degrees = pi/2 radians etc </span>
<span>Quite often we talk about measures of radians in terms of multiples (or fractions) of pi. </span>
<span>To convert from degrees to radians you divide by 180 and multiply by pi. </span> <span>To convert from radians to degrees you do the reverse and divide by pi and multiply by 360. </span>
<span>The term "two radians" therefore is the size of an angle. We can think of it in degrees if that makes more sense by converting it as described above. </span>
<span>2/pi*180 = about 114.6 degrees. </span>
<span>If you are doing any calculus you should always make sure you use radians for your angles.</span>
