DE=DG这个条件错了,应该是DE = EG
取AD中点M,连接CM,FM
取ED中点N,连接BN,FN
CM =AH/2 = AD/2 = FN
FM = DE/2 = EG/2 = BN
角CMD = 角H = 角G = 角BND
角DMF = 角DNF (平行四边形对角相等)
角CMD+角DMF = 角BND + 角DNF
角CMF = 角BNF
三角形 CMF和FNB 全等
CF = BF
∠FCB=∠FBC
DE=DG这个条件错了,应该是DE = EG
取AD中点M,连接CM,FM
取ED中点N,连接BN,FN
CM =AH/2 = AD/2 = FN
FM = DE/2 = EG/2 = BN
角CMD = 角H = 角G = 角BND
角DMF = 角DNF (平行四边形对角相等)
角CMD+角DMF = 角BND + 角DNF
角CMF = 角BNF
三角形 CMF和FNB 全等
CF = BF
∠FCB=∠FBC