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20 13 Tianjin senior high school entrance examination mathematics 18 detailed explanation.
18( 1)S△ABC=6

Process: 4X3÷2=6

(2) Method: Draw arc intersection points with A and B as the center and AB length as the radius respectively, connect all points to make a square with AB length as the edge, and then make a square similar to a square, with vertices intersecting with AC and AB edges, and the inscribed square of △ABC is the required figure. (Figure omitted)