Length x Width x Height
* * * * *
That is only true if the shape is a cuboid. Not if it is a sphere, cylinder, cone, prism, pyramid - all of which have relatively simple formulae.
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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
There is none because a triangle is a 2D shape and volume measures 3D shapes ----------------------------------------------------------------- There is not one. Triangles are two dimensional, volume is three dimensional, a triangle can therefore have an area but not a volume.
The answer will depend on what "it" is.
The 3D space inside a shape is it's volume.