Not sure about the artitic (sic) circle but in 2012 the Arctic Circle was approx 66.56 degrees north of the equator.
It is around 66.66 degrees north but the exact value depends on the tilt of the Earth's axis which changes slightly over time.
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A full circle is 360 degrees. 180 degrees is a half circle. 90 degrees is a quarter circle.
There are 360 degrees in a circle.
There are 360 degrees around a circle
An 180 degrees circle is a semi-circle. A whole circle is 360 degrees.
In degrees? If so then a full circle is 360 degrees, so a half circle is 180 degrees.