All of them. To be precise, since a circle is perfectly round (in theory, although humans can't reproduce such circularity - is that a word?) it will have infinity rotational symmetry.
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A circle has an infinite number of angles of rotational symmetry.
no it does not a full circle does not have rotational symmetry it is unimited it goes on forever
Yes. A circle has infinitely many lines of symmetry and it also has rotational symmetry of infinite order.
i am not sure but i think a trapezium has 1 order of rotational symmetry
No.