A garden is circular with a border 3 m wide around it. The total area including border is 794 m², and the garden area alone is 379.94 m². What is the radius of the garden?

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1. Let the garden radius be $r$. The outer radius is $r+3$.  
2. Areas give $\pi r^2=379.94$ and $\pi(r+3)^2=794$.  
3. From the first: $r^2=379.94/\pi\approx120.94$, so $r=\sqrt{120.94}\approx11.0$.  
4. The radius is about **11 m**, so choose (b).  
FINAL_ANSWER: b

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