The letter "D" has only one line of symmetry, going horizontal across the letter.
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it depends on what kind of 3D shape you want. example= A sphere has an infinite amount of symmetry lines
No but it does have an horizontal line of symmetry
6 lines of symmetry for a 2-d hexagon
16 * * * * * Not sure what a rectangular octagon is but no kind of octagon has more than 8 lines of symmetry.
2 lines of symmetry