如圖，已知點E，C在線段BF上，BE=CF，AB‖DE，∠ACB=∠F.求證：△ABC≌△DEF.

如圖，已知點E，C在線段BF上，BE=CF，AB‖DE，∠ACB=∠F.求證：△ABC≌△DEF.


證明：∵AB‖DE，∴∠B=∠DEF.∵BE=CF，∴BC=EF.∵∠ACB=∠F，∴∠B＝∠DEFBC＝EF∠ACB＝∠F，∴△ABC≌△DEF（ASA）.



已知△ABC全等於△DEF，∠A=52°，∠B=32°12‘，DE=10cm，求∠DFE的度數和AB的長度.


AB＝10，∠DFE＝95°48′

Elden Ring Premiere

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