25.已知△ABC和△ADE是等腰直角三角形,∠ABC=∠ADE=90°,點(diǎn)F為CE中點(diǎn),連接DF、BF.
(1)如圖1,當(dāng)點(diǎn)D在AC上,點(diǎn)E在AB上,請(qǐng)寫出此時(shí)線段DF、BF的關(guān)系(不用證明);
(2)如圖2,在(1)的條件下將△ADE繞點(diǎn)A逆時(shí)針旋轉(zhuǎn)45°時(shí),請(qǐng)證明此時(shí)(1)中的結(jié)論仍然成立;
(3)如圖3,在(1)的條件下將△ADE繞點(diǎn)A逆時(shí)針旋轉(zhuǎn)90°時(shí),連接BD,過點(diǎn)F作FG⊥BD于G點(diǎn),若AB=6,AD=2
,求此時(shí)線段FG的長(zhǎng).