Final answer:
The calculation for side x using the formula x = rθ results in 9.90 m, which rounds to 10 m. This doesn't match any of the given options, indicating a possible error in the question.
Step-by-step explanation:
To find the length of the side x, we need to apply the provided mathematical relationship. The length of side x is determined by the equation x = rθ, where r is the radius and θ is the angle in radians. When we substitute the given values into this equation, we find that x is equal to (0.0450 m)(220 rad), which calculates to 9.90 m. However, the student asks to round this to the nearest meter, which would be 10 m. This is not one of the provided options (a) 12 m, (b) 15 m, (c) 18 m, (d) 20 m, therefore there must be an error in the question or the provided options.