You cannot, no matter how many.
A circle is a two dimensional object with no thickness. So, no matter how many circles you stack on top of one another, the height of that stack will remain zero (mathematicaly true even if hard to grasp). Consequently, you can never into the third dimension (height).
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You need only one to completely describe its dimensions, although you can make lots of measurements.
Vertices imply a 3D object. Circles are 2D so do not have one, but if you meant a sphere, your answer would still be no. This is because you need a corner with three edges meeting together to form a vertex.
To draw circles you need to use a compass
You need only know the radius of each circle to determine that they are congruent. If the radii are identical, the circles are identical. This can also be determined by comparing the diameters (twice the radii), or the circumferences, or the areas of the circles. In all cases, if the parameters are identical, the circles are identical.
You cannot convert a sphere into square metres unless you want the surface area of the sphere. The volume of a sphere would be measured in cubic metres. You would need to be more specific about exactly what you want to know.