Any land that the Antarctic Circle crosses is part of the Antarctic continent.
No.
A line through a circle that does not go through the center of the circle is a secant line. A line through a circle that does go through the center is still a secant line, by the way. Compare this to a line segment that has its two endpoints on the circumference of the circle. That line segment is a cord of the circle. If that cord of the circle passes through the center of the circle, then the cord is a diameter of that circle.
No, the cord of a circle does not have to go through the center of that circle. A chord that does go through the center of a circle is a special case and is called the diameter. A chord can connect any two points on a circle.
Only the Tropic of Capricorn passes through Bolivia. The Equator is located further north, the Tropic of Cancer is even further north, while the Arctic Circle, Antarctic Circle, and Tropic of Cancer are located far to the south.
No. There is something especially peculiar about it: Anywhere south of the Antarctic Circle, the sun will stay up more than 24 hours during some part of the time between September 21 and March 21. The farther south of the Antarctic Circle you go, the longer that time will be. Right at the South Pole, the sun never sets during that whole 6 months. Of course, the other half of the year is even worse in the same places. Anywhere south of the Antarctic Circle, the sun will stay down more than 24 hours during some part of the time between March 21 and September 21. The farther south of the Antarctic Circle you go, the longer that time will be. Right at the South Pole, the sun never rises during that whole 6 months.
through the middle
no
The best places to see an aurora are near the poles of the earth: that would be way north near the arctic circle or way south near the antarctic circle.
Alaska
No. The only chords that go through the center is a diameter.
a tangent to the circle
James Cook went to Antarctica twice, although he did not reach the actual Antarctic continent. He first crossed the Antarctic Circle, on 17 January 1773, in latitude 67 degrees south. A year later, on 30 January 1774, he again crossed the Antarctic Circle as far as 71 degrees 10'S. In each case, he was stopped from going any further by pack ice.