A three dimensional shape is a solid figure or an object which has 3 dimensions which are the length, width and height.
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A cube...
Example- 2 dimensional like a square Example- 3 dimensional like a cube I hope this answers your question! :D
3-dimensional
They are closed 3-dimensional shapes with polygonal faces.
Assuming you mean a pentagon - not penagon, a 3-dimensional pentagon is a dodecahedron which has 12 faces.