Calculation

Using default values.

$$s_{}=\frac{\sqrt{I^2{t}^{}}}{k}$$ $$s_{}=\frac{\sqrt{{\mathrm{7651}}^2\times {\mathrm{0.1}}^{}}}{\mathrm{115}}$$ $$s_{}=\frac{\sqrt{\mathrm{5853780.1}}}{\mathrm{115}}$$ $$s_{}=\frac{{\mathrm{2419.46}}^{}}{\mathrm{115}}$$ $$s_{}=\mathrm{21.04}{\mathrm{mm}}^2$$