Derive from measurements of length, breadth, height, radius, diameter etc.
Measure the volume of displaced liquid when the object is submerged.
If the object is of a material of known density (or specific gravity), weigh it and calculate volume from volume = mass/density.
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WAY 1: multiplying are and the depth of an object WAY 2: dividing weight by the density of an object
The volume of a rectangle is 0. It is a 2-dimensional object and so has no volume.
a square is a 2 dimension object. we can not find volume of a 2-D object... if u are asking that of a cube with equal sides, then simply find (a^3) where a is side of the cube.
To find the volume of a cube, just measure one edge, and then take the third power of that number (which is to say, it gets multiplied by itself 3 times, so for an edge that it 2" long, you would have 2 x 2 x 2 = 8 cubic inches). To find the volume of an irregularly shaped object, you need a graduated cylinder. You immerse the object in water, and you observe how far the water level rises in the cylinder. If the object is soluble in water, you might use some other liquid such as cooking oil.
A triangle is a 2-dimensional object. It has no volume but the volume of an triangular prism is ( volume=Length*width*height ) as well ever since.