volume of a rectangular prism = length * width * height
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The volume of a rectangle (or any other 2D object) is always zero. An object needs to be 3D to have volume.
A = Area V = Volume l = length w = width h = height A rectangle is 2D and has AREA not volume. A = (l)(w) A rectangular prism is 3D and has VOLUME. V = (l)(w)(h)
A 3d rectangle, or a cuboid, has eight corners.
Well it depends on what kind of 3d shape it is. There is a formula to find the volume of each 3d shape. The main formula for volume is Bxh. (Big B multiplied by the height.) Bxh means the area of the base times the height.
Volume = area of cross-section*length