A goat is tethered to the middle of one side of a building that is 10 meters by
10 meters. If the length of the tether is *x*, 0 ≤ *x* ≤ 25, express
the area that the goat can graze as a function of *x*. Note that this will be a
piecewise defined function. For example, when
*x* = 10, the region that the goat can graze is the shaded region below.

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