Times it's length and height.
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Calculate the area of the shape. The formula to be used will be different for different shapes.
To calculate the surface area of a shape find the area of each side, and then, add all of the areas together. The sum of the areas is the surface area.
Depends on the shape of the vessel. Different shape, different formula.
It is to calculate the extent of the shape in 2-dimensional space.
The most direct way to calculate the area of an irregular shape is to superimpose it on graph paper, and then count the number of complete squares that it covers, and for squares that are only partially covered, estimate how much of the square is covered to the nearest simple fraction (a half, a third etc.). If you want the surrounding area rather than the area of the shape itself, you could calculate the total area and then subtract the area of the shape.