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初中《几何》第二册“相似三角形的性质”一节中,有这样一道例题: 有一块三角形余料ABC,它的边BC=120毫米,高AD=
In the section “Characteristics of similar triangles” in the second book “Geometry” of junior high school, there is such an example: There is a triangular residual material ABC, its edge BC=120 mm, and high AD=