Which of the following angles is not coterminal with the other three? Question 15 options: 231° 51° - 129° 591°

51

Step-by-step explanation

Given angles can break like this:

231 = 180 + 51

51 = 0+51

-129 = - 180+51

591 = 360+180+51

so angles 231, - 129 and 591 corresponds to the same terminal while 51 is not related to the particular quadrant. so 51 is not co-terminal with the other three angles.