Volume
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The 3D space inside a shape is it's volume.
It is important to learn and remember the name of 3D shapes. A 19 faced 3d shape is called a nonadecahedron.
3d stands for '3-dimensional', meaning that the shape has three parametres (or directions) for its space, usually translated as it has length, width, and height.
a 4 sided 3d shape is called a triangular prism!!!!!!!!!!!!!!!
a face.