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displacement
The density is equal to the mass, divided by the volume.
"displacement volume"
You still need to divide mass by volume. The problem here is finding the volume. In some cases you can submerge the object in a liquid, and see how much liquid it displaces. You can also calculate its volume mathematically, using integration. This basically means dividing it into small pieces (not the real object, only in the calculations), for example shapes that approximate rectangular blocks, calculate the volume of each piece, and add everything up.
d = m/v Density = mass/volume
Volume of a prism and a cylinder= cross-section area*height or length
There is no formula. That's why it's called irregular!
540
density = mass/volume
density = mass / volume
Density = mass / volume
displacement
The first comprises one rectangular face and four triangular faces whereas the second has two triangular and three rectangular faces.
The word "rectangular" is an adjective, not a noun. So, a "rectangular" cannot exist. The question is like asking for the dimensions of a blue. What you need to do is specify rectangular WHAT! A rectangular pyramid, a rectangular prism, a rectangular dipyramid or some other shape.
I am not sure that a rectangular prism is in any position to care!
The formula to find the volume of a object or container in cc (cubic centimeters) depends on its shape. Different formulae are used for spherical, triangular, rectangular, cylindrical, etc. shapes. There is no formula for finding the volume of irregular shapes.
Finding the volume and comparing it to the mass will give you the density, then it is simply a matter of looking up which materials have that density to find what it is. And that is how you can tell how the density can be used