Is the earth flat or round?

The Bible describes it as “the circle of the earth”, so it would be round like a “circle” and not flat:

Isaiah 40:22 King James Version (KJV)
22 It is he that sitteth upon the circle of the earth, and the inhabitants thereof are as grasshoppers; that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell in: