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The symbol of the International Mathematical Congress is shown in the figure. It is a right triangle composed of four right triangles, and the length of two or three sides is a big square.
Total area of four right-angled triangles: 3×2÷2×4= 12,

Area of small square: (3-2) 2 =1;

Area of the big square: 12+ 1 = 13.

A: The area of the Grand Plaza is 13.

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