Create these two commands and it worked for me.
l1=Sequence((r cos(2π i / n + ang), r sin(2π i / n + ang)), i, 0, n, 1)
l2=Sequence(CircularArc((0, 0), Element(l1, 2i - 1), Element(l1, 2i)), i, 1, n / 2, 1)
do you mean Curve(r cos(t + ang), r sin(t + ang), t, 0, 2π) ?
Thank you. This command does work well to rotate the circle with dashed large line.
Maybe you mean something as in the attachment
Thanks for clarifying.
thanks @rami and @mathmagic
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