You multiply all three dimensions. This only applies for prisms.
For example, for a prism with sides 3, 5, and 9, you multiply the dimensions (3*5*9) = 135 units cubed.
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Depending on the shape of the 3D object, you need additional dimensions like diameter or width and height besides the length, in order to calculate the volume.
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When multiplying length by width by height, the volume of the object is calculated. Volume is measured in cubic metres, or m3.
The volume of an object can be determined by the displacement of water. By dropping the object into a measuring container of water, where the volume of the water is known, the object's volume can then be calculated by subtracting the volume of the water by the volume of the water and object combined.
To find the volume of an irregular object using a graduated cylinder, you can use the method of water displacement. Fill the graduated cylinder with a known volume of water, then carefully submerge the irregular object in the water. The increase in water level corresponds to the volume of the object. Subtract the initial volume from the final volume to determine the volume of the irregular object.