Which of the following angles is not coterminal with the other three? a. 591° b. 231° c. 51° d. –129°

C)

Explanation:

As we know that angle in same quadrant with same magnitude is known as coterminal angle

so lets discuss each angle

a)

so we can say it is

so it is 51 degree with negative x axis in third quadrant

b)

so we can say it is

so it is 51 degree with negative x axis in third quadrant

c)

so it is 51 degree with negative x axis in third quadrant

d)

so we can say it is

so it is 51 degree with negative x axis in third quadrant

So coterminal angles are 591, 231 , -129

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d.7.5cm is your answer