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The cost of fencing a circular garden at ₹180 per metre is ₹6,786. Find the radius of the garden.

1. 6 m
2. 7 m
3. 8 m
4. 9 m

Correct answer: 6 m

Solution

Total fencing length = \(6786/180 = 37.7\) m. For a circle, circumference is \(2\pi r\), so \(2\pi r = 37.7\). Using \(\pi\approx 3.14\), \(r\approx 37.7/6.28\approx 6\) m.

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