By calculating the areas of the rectangular bottom part, (LxW) , and then using pi to find the area of the top rounded part. (3.14 x Radius x Radius divided by 2) - if the rounded section is half a circle
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You need the area to find the volume of an object.
Mass = Pressure*Area
Pi x radius2 x height
There are basically two techniques for finding the area of a shape with uneven or irregularly shaped sides. If the sides can be described by algebraic equations, then integral calculus can be used to find the area. Failing that, you can approximate the irregular shape by fitting in a number of smaller, regularly shaped polygons such as squares and triangles, whose area can be calculated by simple geometric techniques.