The volume of anything is always the area of the base of the object times the height. Therefore, to find the volume the object must have a height, which makes volume work with all 3D shapes. If one is looking at a 2D shape, then there is no height so a volume cannot be calculated (note: areas may be found of 2D shapes).
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A pentagon is a 2D shape. Volume and Surface Area is only found in 3D shapes.
3 dimensional objects have volume and surface area whereas 2 dimensional shapes have only surface area
2d shapes only have length and width, while 3d shapes have length, width and depth.
They are shapes that occupy a volume in space. They have a length, width (or breadth) and height.
The special features of 3D shapes are they all are 3D which means they are fat but 2D shapes are flat they can not stand up.