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it depends on what kind of 3D shape you want. example= A sphere has an infinite amount of symmetry lines
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.
There can be no closed 3D shape with only one square and 3 triangles.