'Circle' in the Bible

When David inquired of Yahweh, he said, "You shall not go up. Circle around behind them, and attack them over against the mulberry trees.

When he established the heavens, I was there; when he set a circle on the surface of the deep,

It is he who sits above the circle of the earth, and its inhabitants are like grasshoppers; who stretches out the heavens like a curtain, and spreads them out like a tent to dwell in;