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题如图,△ABC 是锐角三角形,正方形 DEFG 的一边在 BC 上,其余的顶点分别在AB、AC 上,△ABC 的面积为正方形DEFG的面积为S_2则有()
In the figure, △ABC is an acute triangle, one side of square DEFG is on BC, and the rest of the vertices are on AB and AC, respectively. The area of △ABC is square. The area of DEFG is S_2. ()