如圖點(diǎn)c為線段ab的中點(diǎn) 如圖，點(diǎn)C在線段AB上？
如圖，點(diǎn)C在線段AB上？連接BD，AE，∵ad=CB，∵bad=≌FCB=90°，ab=CF，≌abd≌△CFB，≌BD=FB，∵abd=≌CFB，∵abd≌FBC=≌CFB≌FBC=90°Ko≌DB
如圖，點(diǎn)C在線段AB上？
連接BD，AE，∵ad=CB，∵bad=≌FCB=90°，ab=CF，≌abd≌△CFB，≌BD=FB，∵abd=≌CFB，∵abd≌FBC=≌CFB≌FBC=90°Ko≌DBF=90°o，即≌BDF為等腰直角三角形，≌BFD=45°和≌AFD=≌AFB-≌BFD=6°和≌BFE=6°和≌DFE=39°