This structure can be defined by the parametric eq
This structure can be defined by the parametric equations x equals cos t times the quantity A plus b cos one-half t, y equals sin t times the quantity A plus b cos one-half t, and z equals b sin one-half t. This structure can also be formed by cutting a Klein bottle in half; cutting this structure results in paradromic rings. This nonorientable surface has Euler characteristic zero. For 10 points, name this structure often formed by making a half-twist in a strip of paper and connecting the ends, which allows one to draw a single line encompassing both sides of that paper.
This structure can be defined by the parametric equations x equals cos t times the quantity A plus b cos one-half t, y equals sin t times the quantity A plus b cos one-half t, and z equals b sin one-half t.