A half.
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There is no 180' circle that would be half a circle. A complete circle is 360 degrees A circle is 360º no matter what its size is.
There are 360 degrees in a circle so 45 degrees is 1/8th of a circle.
180 degrees is half of a full turn, which is equivalent to 1/2 of a turn. This is because a full turn is 360 degrees, so half of that would be 180 degrees. Therefore, 180 degrees can be expressed as the fraction 1/2 when referring to a complete turn.
1/2
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