Question

determine the angle of rotational symmetry (magnitude) for the figure. none 60° 120° 180°

Explanation:

Step1: Identify number of equal - parts

The radiation symbol has 3 equal - parts.

Step2: Calculate angle of rotation

The formula for the angle of rotational symmetry $\theta=\frac{360^{\circ}}{n}$, where $n$ is the number of equal - parts. Here $n = 3$, so $\theta=\frac{360^{\circ}}{3}=120^{\circ}$.

Answer:

C. $120^{\circ}$