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如图,在Rt△ABC中,作斜边AB上的高CD,又可得直角三角形ACD及CBD,习惯上把大小三个直角三角形称为母子三角形.
As shown in the figure, in Rt △ ABC, for the high CD on the hypotenuse AB, we can also get the right angle triangle ACD and CBD, customarily the size of the three right triangles is called the mother and child triangle.