Firstly, with the unit circle (r=1) we need to know that:
at 270 degrees our coordinates are (0, -1)
sine(270 degrees) = -1
cosine(250 degrees) = 0
cotangent = cosine / sine
therefore: cot ( 270 degrees) = 0/-1 = 0
The answer is 0.
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The cotangent of 510 degrees is: -1.73205081
It is approx 1.8040
Cotangent(0.675 radians) = 84.88 approx.
270 is an integer and so it would be sensible to represent it as an integer: 270 degrees. There is no requirement in the question to change the measurement unit, and if you do want that then you will need to specify the required unit. I suggest the answer should be 3*pi/2 radians.
Assuming that you mean 270 degrees and not radians or any of the other angular measures, the answer is 3/4.