Final answer:
To evaluate csc 120° to the nearest tenth, use the unit circle and the reciprocal of the sine function.
Step-by-step explanation:
The expression csc 120° can be evaluated using the unit circle. The cosecant function is the reciprocal of the sine function, so csc 120° is equal to 1/sin 120°. In the unit circle, the sine of 120° is √3/2. Therefore, csc 120° is equal to 1/(√3/2), which simplifies to 2/√3. To the nearest tenth, this is approximately 1.2.