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90
Yes. Any equilateral shape can have both rotational and line symmetry.
It has a degree of 90* * * * *No, it does not. It has 180 degree rotational symmetry.
It is called its order of rotational symmetry depending on its shape as for example a square has rotational symmetry to the order of 4 because it returns to its same shape every time of a turn of 90 degrees and so 360/90 = 4
A semicircle.