How to get the surface area of a tinsurface?

Hi,

I need to find out the area in m² of tin surface. In order to check this, I made an example tin-surface from the shown profile:



This tin should have a surface-area of 14m² or 1400cm². Since I can't find this number in the statitstics, I presume it is not shown.



Is there a way to find out the surface of a tin?

Thank you!

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