It is a three dimensional solid object.
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Solid geometry.
A net is a 2D representation of a 3D shape
in 2D, a heptagon in 3D, a heptahedron
YES!!! Any 'solid' object is 3-dimensional.
Platonic solids are 3D shapes formed using only regular shapes. Only 1 type of regular shape is used to make a platonic solid. Platonic solids are the simplest and purest form of 3D shapes.