Question

what is the smallest angle of rotational symmetry for a square? 90° 45° 180° 360°

Explanation:

Step1: Find rotational symmetry order

A square has 4-fold rotational symmetry (order = 4).

Step2: Calculate smallest rotation angle

Smallest angle = \( \frac{360^\circ}{\text{order}} = \frac{360^\circ}{4} = 90^\circ \).

Answer:

B. 90°