A net for a geometric solid is the 2-D pattern for constructing the 3-D shape.
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A cylinder.
The edge of a 3D shape is called an "edge." It is the line segment where two faces of the shape meet. In geometric terms, an edge is one of the fundamental components that define the structure of polyhedra and other solid figures.
A 2d shape is a flat object (ex: square, circle, etc.) and a 3d shape is a shape in space (ex: cube, sphere, etc.)
It is a volume (3D) shape - "solid" has nothing to do with it.
A solid