None.
Yes. It crosses both of them, at 0 degrees longitude.
Amazonia
chad
danube
It actually pass through five african countries namely Namibia, South Africa, Zimbabwe, Botswana & Mozambique.
Circle
a circle
it has 41 countries
One
A circle has an infinite number of lines of symmetry. This is because any line drawn through the center of the circle will divide it into two equal halves, regardless of the angle at which the line is drawn. Therefore, there are countless ways to draw such lines, resulting in infinite symmetry.
It means that if you take a circle and find its area, you must now find a square with the same area. We cannot square the circle.
australia