A right angle has one line of symmetry.
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A regularpentagon has 5 lines of symmetryAny pentagon could have less and so can have up to 5 lines of symmetry.
None.
Four * * * * * If the question refers to an octagon, rather than an octogan, it can have 8 lines of symmetry although it need not have any.
a yin-yang symbol has point symmetry but no line symmetry so 0
One right angle is 90 degrees. If it's anything else, it's not a "right" angle.