The center of the two circles are different points...............but the measurements are the same......................the top circle is centered at (0, 1/2).........................one half up the Y axis............and the bottom one at..........(0, - 1/2)........................one half down along the Y axis..........in the negative direction................................again...........a distance of 1...............the two interlocking circles from an ellipse whose minor axis is one.............and whose major axis is twice 0.866.................I rounded it................