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divide the beam into three rectangles, calculate the area of each rectangle and multiply it by length. then you get the volume of beam & finally multiply it by density
150*150*10thk h beam weight per meter
It is not possible to calculate the area given only the volume.
You cannot calculate volume of surface area. If you meant 20m3, then the volume would be 20,000 litres.
Not enough information. To calculate mass, you would need volume and density (mass = volume x density).