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it depends on what kind of 3D shape you want. example= A sphere has an infinite amount of symmetry lines
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.
triangle * * * * * A triangle is NOT a 3d shape! A cube.
What you do is for example on a cube the lines are diagonal and on a normal square the line is strait! In every 3d shape or anything there is always a diagonal line.
A curved line in 3-dimensional space.