Find an angle between 0 and 2π that is coterminal with 27 pi/10

27pi/10 * 180/pi = 486, but since we want a coterminal angle between 0 and 2pi we substract 360, 486-360 = 126 (this is the answer in degree form), = 126 * pi/180 = 7pi/10

to make sure this is the right answer we have to check if the reference angles are the same, which is this case they are. (180-126 = 54) (540-486=54)