Puzzle Details

A local farmer wants to keep his horses safe.

He has one mile of fence, with which to surround the horses.

Luckily there is a very straight river which he can also use.

Obviously the farmer wants to fence off as much land as possible, what shape will the fenced off area be and how large?

[Ref: ZLHI]

Hint: You might need to remember the formula for the area of a circle (= Pi x radius x radius)

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