A Sphere is a circle + another + another. It is 360 degrees of circles.
Isaiah and Job were right about their statements of the earth being a circle and a sphere and hanging upon nothing.
Isaiah was directly inspired of Jehovah. Job was just a guy who was speaking to other people and had no inspiration.
I believe that back then they believed in the truth of the matter in that the earth was not square or a cube but it was a sphere; but false religion changed that.