No. Any great circle on the earth has a circumference of about 24,000 miles. The circumference of the Arctic Circle (and the Antarctic circle too) is about 9,945 miles. Imagine circles around the North Pole. The closer to the pole the circle is, the smaller it is. If you were right there at the North Pole, you could walk a 10-foot circle around it. The Arctic Circle is a circle around the pole, but about 1,570 miles south of it. The only circle around the pole that's a great circle is the Equator.
Great Bear Lake is on the Arctic Circle in the Northwest Territories.
Partially.
Great Bear Lake
No; neither of the tropics is a great circle. The only line of latitude that is a great circle is the equator. The arctic and antarctic circles are not great circles, either.
It is south of the Arctic circle.
Great Bear Lake
The Arctic Circle passes through the Arctic Ocean.
Great Bear Lake
Great Bear Lake
The Great Bear Lake
A polar circle is either the Arctic Circle or the Antarctic Circle.
the Himalayas are south of the Arctic Circle