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如图1,在四边形ABCD中,如满足AB=AD,∠B+∠D=180°.E,F分别是BC,CD上的点,且∠EAF=1/2∠BAD,这样的图形我们称为“半角”模型.例1倡导研究性学习方式,着力教材研究,习题研究,是学生跳出题海,提高学习能力和创新能力的有效途径.下面是一案例,请同学们认真阅读、研究,完成“类比猜想”及后面的问题.习题解答
As shown in Figure 1, in a quadrilateral ABCD, AB = AD, ∠B + ∠D = 180 ° .E, F are points on BC, CD, and ∠EAF = 1 / 2∠BAD, such a graph we call Example 1 Advocating research-based learning, focusing on textbook research, exercise research, is an effective way for students to jump out of the sea, improve their learning ability and ability to innovate.Following is a case study, students are required to carefully read, Research, complete “analog guess ” and the following questions