如圖,在△ABC中,AB=AC=2,∠B=40°,點(diǎn)D在線(xiàn)段BC上運(yùn)動(dòng)(點(diǎn)D不與點(diǎn)B,C重合),連接AD,作∠ADE=40°,DE交線(xiàn)段AC于點(diǎn)E.
(1)當(dāng)∠ADC=63°時(shí),∠BAD=
23°
23°
;當(dāng)點(diǎn)D從點(diǎn)B向點(diǎn)C運(yùn)動(dòng)時(shí),∠BDA逐漸變
小
小
(填“大”或“小”).
(2)當(dāng)∠CAD=
70
70
度時(shí),△ABD≌△DCE?請(qǐng)說(shuō)明理由.