Both are theoretically the same. It depends on the accuracy of your measurements and the method of measurement. Are you measuring at exactly theoretical sea level or up and down mountains and valleys (along the sea floor?) etc. I do believer that the Earth is slightly larger south of the equator and so the Antarctic circle could be larger.
On average, yes.
The antarctic is colder than the arctic because of Antarctica, the continent, on which is stored 90% of the Earth's store of ice.
No, it's not.
There is a continent south of the Antarctic Circle, while the Arctic Circle surrounds sea ice.
Yes, by about 30 degrees F. This is because there is a continent in the Antarctic and there is only sea ice in the Arctic.
No. Boston, Mass in the USA is closer to the Arctic Circle than to the Antarctic Circle. Boston and the Arctic are both in the Northern Hemisphere: Antarctica is in the Southern Hemisphere.
Antarctica is colder than the Arctic. The average temperature in Antarctica is around -49 degrees Celsius (-56 degrees Fahrenheit), while the Arctic's average temperature is around -34 degrees Celsius (-29 degrees Fahrenheit).
Yes.
Warmer
Because the antarctic region is colder than the arctic and the Polar bear won't get the warmth it needs.
The UK is the closer.
The continent of Antarctica is in the Antarctic, storing 90% of the earth's store of ice. It is about 30 degrees F colder in Antarctica than in the open water of the Arctic ocean. Antarctica is a continent surrounded by the Southern Ocean. The Arctic is open water -- the Arctic ocean -- surrounded by land.