Learning exercise 1: who first stipulated that the earth was round?

Is. 40:22 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...Skeptics will assume from these verses a concept of a flat, circular, pancake-like earth. In each case, the Hebrew word here is exactly the same, as Strong's tells us:2329. chuwg, khoog; from H2328; a circle:--circle, circuit, compass.
And here is where we alert the reader to another key word-concept that is missing in Hebrew: There was no varying word for a "sphere" - a three-dimensional circle. It is not that the Hebrews or anyone else lacked the concept of sphericity (for obviously, they could conceive of it plainly when, for example, they ate pomegranates for breakfast!), but that they simply did not create a second word for it.Some may cite in reply here the KJV version of Is. 22:18, "He will surely violently turn and toss thee like a ball into a large country: there shalt thou die, and there the chariots of thy glory shall be the shame of thy lord's house." The Hebrew word here, however, is:1754. duwr, dure; from H1752; a circle, ball or pile:--ball, turn, round about.