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

1. 10.5 m
2. 11 m
3. 11.5 m
4. 12 m

Correct answer: 11 m

Solution

The garden area is 379.94 m², so \(\pi r^2 = 379.94\). Using \(\pi \approx 3.14\), \(r^2 = 379.94/3.14 = 121\), hence \(r = 11\) m.

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