\(\displaystyle{O}\)

\(\displaystyle{S=\pi\times r^{2}}\) \[P_x(\rho ,g,H,h,B)=B\cdot g\cdot \left ( H\cdot h-\frac{h^{2}}{2} \right )\cdot \rho [N]\] https://www.k123.org.uajExSvg1_draw.html

https://upbyte.net/news/mathjax_in_svg_diagram/2015-05-29-516