The figure above shows some of the dimensions of a triangular plaza with an \(L\)-shaped walk along with two of its edge

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The figure above shows some of the dimensions of a triangular plaza with an \(L\)-shaped walk along with two of its edges. If the width of the walk is 4 feet and the total area of the plaza and walk together is 10,800 square feet, what is the value of \(x?\)

A. 200
B. 204
C. 212
D. 216
E. 225

[spoiler]OA=A[/spoiler]

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