Follow the road laws of the country that you are in. In some countries the traffic already in the circle has priority. In others, traffic entering the circle has priority. Very clearly a recipe for disaster if you forget which country with which rules you are in!
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The Arc de Triomphe in Paris.
It has at most one.
The tangent line only touches the outside of a circle at one given point. So an outside line perpendicular to the circle's diameter at 90 degrees should do.
There is no volume in a circle but volume can be found in a sphere. The question should be rephrased. A circle is a two dimensional shape, so it cannot have a volume which is a characteristic of a three dimensional shape.
a circle a circle a circle a circle