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在《相似形》一章的学习中,课本第215页例6是这样的:“平行于三角形的一边,并且和其他两边相交的直线,所截得的三角形的三边与原三角形三边对应成比例”.这道例题我们还可以推广为:“与三角形两边的延长线相交且平行于第三边所截得的三角形的三边与原三角形三边对应成比例”.由此我们可以得到如图1所示的两个基本图形,不妨将其称为“A”型图与
In the chapter “Similar Shapes”, Example 6 on page 215 of the textbook is this: “A line parallel to one side of a triangle and intersecting with the other two sides corresponds to the three sides of the original triangle. Proportional. We can also extend this example: “The three sides of the triangle intersecting the extensions of the sides of the triangle and parallel to the third side are proportional to the three sides of the original triangle.” Thus we can obtain As shown in Figure 1, the two basic figures may be referred to as “A” charts and