There are three ways a line and a circle can be associated, ie the line cuts the circle at two distinct points, the line is a tangent to the circle or the line misses the circle. To work out which ...

We use imaginary lines to help locate where a place is in the world. the Arctic Circle (the North Pole) the Antarctic Circle (the South Pole) the Tropic of Cancer the Tropic of Capricorn and the ...