From EoEarth: "As of 2000, it lies at latitude 66° 33′ 39″ south of the equator."
Yes, there is an Antarctic Circle.
The Antarctic Circle crosses open ocean water for 99% of its length, meaning that a tiny percent of the circle crosses land -- Antarctica, in fact. At the precise location of the Antarctic Circle on Antarctica, there are no known residents. At sea, a sailor would work hard to maintain any residency in the Antarctic Circle. Your name for this person would be up to you to define.
Antarctic Circle
The Tropic of Capricorn marks the point on Earth where the sun is directly overhead at the solstice. The Antarctic Circle marks the location where there is at least one 24-hour period of no sunrise/ sunset per year. The Tropic of Capricorn is north of the Antarctic Circle.
The answer will vary significantly depending on whether you're asking about the temperature or the location, both of which can be expressed in degrees.
The Antarctic Circle is about 66 degrees S.
The Antarctic Circle surrounds Antarctica.
The Antarctic Circle
Only Antarctica is crossed by the Antarctic Circle.
The Antarctic Circle does not pass through any countries.
Antarctica is south of the Antarctic Circle, yes.
Yes, the Antarctic Circle is south of Africa.