25.如圖1,在矩形ABCD中,AB=5,BC=8,點(diǎn)E,F(xiàn)分別為AB,CD的中點(diǎn).
(1)求證:四邊形AEFD是矩形;
(2)如圖2,點(diǎn)P是邊AD上一點(diǎn),點(diǎn)A關(guān)于BP的對(duì)稱點(diǎn)為點(diǎn)M.
①當(dāng)點(diǎn)M落在線段EF上時(shí),求∠ABP的度數(shù);
②如圖3,連接AM交BP于N點(diǎn),連接DM,當(dāng)△AMD是等腰三角形時(shí),直接寫出AN的長.
?