In this case, you need to determine the Area of overlapping circles which have their centers at the corners of the square paddock, and which have the same radius.
Describing the solution to this question is relatively complex, so I will refer you to a site where a solution to this question is clearly illustrated.
When you see the illustration, you will be able to insert the information from your problem, and determine the answer.
http://www.analyzemath.com/Geometry/circles_problems.html
Paste this address into a web browser.
Joseph C.
tutor
Please look ant the answer to that question to see the method.
The answer is 19.1m.
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09/08/15
Miki M.
09/07/15