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180 degrees is half a rotation so probably a half.
1/2
The fraction 1/2 (one half) is the same as the ratio 1 to 2 (written 1:2) Simply turn the fraction bar into a colon, after reducing the fraction.
The answer depends on what you want to turn into a fraction. And, incidentally, I do not turn into a fraction.
When you turn a fraction over you get a reciprocal.