The flag of Russia has two lines of symmetry. One line of symmetry can be drawn horizontally, dividing the flag into two equal halves. The other line of symmetry can be drawn vertically, also dividing the flag into two equal halves. This makes the flag of Russia a symmetrical design.
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They may have no lines of symmetry or they may have some - it all depends upon the shape of the irregular octagon. Only regular octagons have 8 lines of symmetry.
A dodecagon has 12 sides, so it has 12 lines of symmetry. Each line of symmetry divides the dodecagon into two equal halves, making it look like a mirror image. So, if you're ever in doubt, just remember that a dodecagon is as symmetrical as a Kardashian selfie.
It depends on what shape the glass is.
A square has 4. A pentagon may have 0, 1 or 5.
One or none.