gambit
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He did not say so. He said the J-20's lower front fuselage has the CONTOUR of a curvature of a circle.You cannot say J-20 chin is circle if the curve is not a closed curve with equidistant.
If you have this bad of a reading comprehension problem, as we have seen continually, you have no business in this discussion.
So what was your 'study' in aviation?