(2008?永春县)已知:如图,∠A=∠DCF,F是AC的中点.求证:△AEF≌△CDF
(2008?永春县)已知:如图,∠A=∠DCF,F是AC的中点.
求证:△AEF≌△CDF.
证明:∵F是AC的中点,
∴AF=CF.
∵∠A=∠DCF,∠AFE=∠CFD,
∴△AEF≌△CDF(ASA).
问:初三几何已知:AB=AC,点D是BC的中点,CF//AB,求证:BP平方=PE*PF.
答:证明: 连接CP CF//AB ===>∠CFP=∠ABP 显然,∠ABC=∠ACB 点D是BC的中点,==>AD垂直平分BC==>PB=PC ==>∠PBD=...详情>>
答:详情>>