Two.
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It has 1 order of rotational symmetry.
If it's a regular 8 sided octagon then it rotational symmetry to the order of 8
i am not sure but i think a trapezium has 1 order of rotational symmetry
An ellipse has rotational symmetry of order 2.
Yes. A circle has infinitely many lines of symmetry and it also has rotational symmetry of infinite order.