This linear relationship between the linewidth and fold angle was confirmed in previous research    \cite{shigemune2016origami} . Figure 7c reveals that the coefficient of determination R2 values were close to 1 for all numbers of lines; thus, the triangle approximation can be considered appropriate. Although, for the same linewidth, θ differs according to n. The value of m decreases as n increases. This is due to the difference between the “folding” and “bending” of the SCS creases, as discussed by Liu et al \cite{liu20162d} . When the linewidth is low (L = 5 mm), as shown in Figure 7d, the error of the triangle approximation is small because the creases are far from each other. When the linewidth is low (= 5 mm), as shown in Figure 7d, the creases are closer to the “folding” shape, and the error of the triangle approximation is smaller because the creases are far from each other. However, as the linewidth increases (L = 15 mm) and shifts to a “bending” shape, the effect of the approximation increases, and θ decreases. As shown in Figure 7e, the more the number of lines, the closer the folds, and the shorter the straight-line parts. Therefore, with an increase in the number of lines, the creases shift toward a “bending” shape as the linewidth changes. Consequently, if the distance between the lines is small, the change in the gradient of the straight-line parts caused by the linewidth is difficult to observe, and the observed value is smaller than the actual value. Thereafter, we derived the relationships between L and d and L and from the fold angle. The diagonal side i/2+L/2 of the right triangle shown in Figure 7a is defined from Equation (1) as follows: