Question

a rational symmetry of order is called​

Answer 1

Answer:

Fold rotational symmetry, or discrete rotational symmetry of the nth order.

Step-by-step explanation:

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Answer 2

Answer:

Rotational symmetry of order n, also called n-fold rotational symmetry, or discrete rotational symmetry of the nth order, with respect to a particular point (in 2D) or axis (in 3D) means that rotation by an angle of 360°/n (180°, 120°, 90°, 72°, 60°, 51 3⁄7°, etc.) does not change the object.