$${\text{pinge} = \frac{F}{A} = \frac{F}{\pi R^2} = \frac{6,2 \times 10^4\, \mathrm{N}}{(\pi)(9,5 \times 10^{-3}\, \mathrm{m})^2} \\ = \underline{\underline{2,2 \times 10^8\, \mathrm{N/m^2}}}}$$