It is hard to calculate the volume of any irregular shape. Approximations can be made by modeling a human as a series of connected cylinders, spheres, and ellipsoids of the appropriate dimensions. You coluld test the accuracy of your model by measuring the amount of fluid displaced when the human you modeled is completely immersed.
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A person can calculate the volume of a cone by multiplying the height by pi and by the square of the radius of the cone, and then dividing the result of the previous operations by three.
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).
You can use either your eyes, calculate the volume or practically pour liquids in a given container to find out which one has a bigger volume.