Oh, what a lovely question! A crescent shape does indeed have rotational symmetry. If you were to turn it around its center point, it would look the same at certain angles. Isn't that just a happy little discovery?
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Yes, a crescent does have rotational symmetry. Rotational symmetry refers to the ability of a shape to be rotated by a certain angle and still look the same. In the case of a crescent, if you rotate it by 180 degrees, it will look the same as its original position, thus demonstrating rotational symmetry.
It has rotational symmetry to the order of 2
A regular nonagon with 9 sides has a rotational symmetry of 9.
Rotational symmetry of order 1.
A line has 180 degrees rotational symmetry.
They have not got any rotational symmetry