题目及图如图,

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题目及图如图,题目及图如图, 题目及图如图,由题∵DH=DF∴∠DEF=∠DFE∵EH=FH∴∠HEF=∠HFE又∵∠DEH=∠DEF+∠HEF∠DFH=∠DFE+∠HFE∴∠DEH=∠DF

题目及图如图,
题目及图如图,
 

题目及图如图,
由题∵DH = DF
∴∠DEF = ∠DFE
∵EH = FH
∴∠HEF = ∠HFE
又∵∠DEH = ∠DEF + ∠HEF
∠DFH = ∠DFE + ∠HFE
∴∠DEH = ∠DFH