Convert 120 degrees to radians.

Step 1 ：\(\text{We know that } 180^\circ = \pi \text{ radians.} \)

Step 2 ：\(\text{So, to convert degrees to radians, we can use the formula: } radians = \frac{degrees \times \pi}{180}\)

Step 3 ：\(\text{Substituting } 120 \text{ for degrees in the formula, we get: } radians = \frac{120 \times \pi}{180}\)