Circular hollow section
<img src="https://eng-calculations.com/SVG/EN/EN_10219-2/Circular hollow section.svg" alt="Circular_hollow_section" title="Circular_hollow_section">https://eng-calculations.com/SVG/EN/EN_10219-2/Circular hollow section.svg
<img src="https://eng-calculations.com/SVG/EN/EN_10219-2/Circular hollow section.svg" alt="Circular_hollow_section" title="Circular_hollow_section">https://eng-calculations.com/SVG/EN/EN_10219-2/Circular hollow section.svg