Spherical shell
<img src="https://eng-calculations.com/SVG/EN/EN_13445-3/Spherical shell.svg" alt="Spherical_shell" title="Spherical_shell">
https://eng-calculations.com/SVG/EN/EN_13445-3/Spherical shell.svg
<img src="https://eng-calculations.com/SVG/EN/EN_13445-3/Spherical shell.svg" alt="Spherical_shell" title="Spherical_shell">
https://eng-calculations.com/SVG/EN/EN_13445-3/Spherical shell.svg