2.已知直線1為長(zhǎng)方形ABCD的對(duì)稱(chēng)軸,AD=5,AB=8,點(diǎn)E為射線DC上一個(gè)動(dòng)點(diǎn),把△ADE沿直線AE折疊,點(diǎn)D的對(duì)應(yīng)點(diǎn)D'恰好落在對(duì)稱(chēng)軸1上.
(1)如圖,當(dāng)點(diǎn)E在邊DC上時(shí),
①填空:點(diǎn)D'到邊AB的距離是
; ( 直接寫(xiě)出結(jié)果)
②求DE的長(zhǎng).
(2)當(dāng)點(diǎn)E在邊DC的延長(zhǎng)線上時(shí),(友情提醒:可在備用圖上畫(huà)圖分析)
①填空:點(diǎn)D'到邊CD的距離是
;(直接寫(xiě)出結(jié)果)
②填空:此時(shí)DE的長(zhǎng)為
.(直接寫(xiě)出結(jié)果)