" A sphere has no corners. But Isaiah 40:22 speaks of “the circle of the earth”."

Actually, "Compass" is the word. The compass was and still is used to draw circles on flat surfaces: one end with a sharp point stuck into the paper, and a second point to scribe an arc. The Bible claims that the gods used a compass to draw a circle on the flat Earth and then put a crystal dome over the circle to keep the celestial water out.