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SYMMETRY

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An object has rotational symmetry if it looks the same as it did originally when rotated.

The order of rotational symmetry is the number of times an object looks the same as it did originally when it is rotated through 360°. Even if a shape appears to have no rotational symmetry then the order of rotational symmetry will still be 1, because every shape looks the same at the end of a 360° rotation as it did originally.

for every regular shape (for e.g. equilateral triangle, square and etc.) the rotational symmetry of the shape is equal to the number of sides it has
for e.g a regular pentagon has a rotational symmetry of order 5.
A circle as it has no sides the order of rotational symmetry is infinity.
 
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