Any one of the infinitely many values.
Any one of the infinitely many values.
Any one of the infinitely many values.
Any one of the infinitely many values.
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It has rotational symmetry.
a starfish has a rotational symmetry because it rotates back to itself 90 degrees which is 1/4 of a turn.
Any shape with a rotational symmetry of order 2 or more.
It is 360 degrees divided by the order of rotational symmetry.
Because a rhombus which is rotated through 180 degrees will coincide with itself.