Question

What is the smallest angle of rotational symmetry for a square

Answer 1

When we rotate a figure and there is no change in the shape of the figure then it has rotational symmetry.

We know that the order of rotation for a square is 4.

Hence, we have $\frac{360}{4} =90^{\circ}$

Thus, the angle of rotational symmetry of square are

$90^{\circ}, 180^{\circ}, 270^{\circ}$

Hence, the minimum angle  of rotational symmetry is  $90^{\circ}$

Therefore, the minimum angle of rotational symmetry for a square is 90 degrees.

Answer 2

Is it 90 degrees because all square have a 90 degree angle?