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浙教版初中数学第三册义务教材P_(39_有一段话:“在透明纸上画一个等腰三角形ABC,画出它的顶角平分线AD,然后沿AD所在的直线把△ABC对折,于是就会发现位于AD两旁的部分(△ABD和△ACD)能够互相
Zhe Jiaochu Junior High School Mathematics Vol.3 Compulsory Textbook P_(39_ has a paragraph: ”Draw an isosceles triangle ABC on transparent paper, draw its peak bisector AD, and then follow the straight line AD to △ABC By folding, you will find that the parts located on both sides of AD (△ABD and △ACD) can interact with each other