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典型例题[例1](2007年青岛)将平行四边形纸片ABCD按如图1方式折叠,使点C与A重合,点D落到D′处,折痕为EF. (1)求证:△ABE≌△AD′F; (2)连接CF,判断四边形AECF是什么特殊四
Typical Example [Example 1] (Qingdao 2007) The parallelogram ABCD is folded as shown in Fig. 1 so that point C coincides with point A, point D falls to point D ’, and crease EF. (1) Verification: △ ABE≌ΔAD’F; (2) Connect the CF to determine what the quadrilateral AECF is