YOU SAID:

if a potato is round wouldn't the earth be round aswell

INTO JAPANESE

じゃがいもが丸いならば、地球も丸くない

BACK INTO ENGLISH

If the potatoes are round, the earth is not rounded

INTO JAPANESE

じゃがいもが丸い場合、地球は丸くない

BACK INTO ENGLISH

If the potatoes are round, the earth is not rounded