【Haichuan Teahouse】Brain-teasing Series: The graphic structure is relatively simple
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Two identical rectangles overlap partially; the length of each rectangle is 2 and its width is 1. What is the area of the shaded region in the figure?
【Haichuan Teahouse】Brain-teasing Series: A challenge for fifth graders https://bbs.hcbbs.com/thread-3350948-1-1.html (Source: Huahai Chuanliu – Haichuan Chemical Industry Forum)
Based on the given information, let the side length of the shaded quadrilateral be X; using the Pythagorean theorem, it can be determined that X = 1.25. In the figure, the area of the rectangle equals the area of the shaded region plus the areas of the two triangles, which is 2; therefore, the area of the shaded region is 1.25
【Haichuan Teahouse】Brain-teasing Series: Another session on practicing the principle of inclusion and exclusion https://bbs.hcbbs.com/thread-3349843-1-1.html (Source: Huahai Chuanliu – Haichuan Chemical Industry Forum)