Provide an appropriate response.In the figure below, BD = 
AB, and DE = FC = 
AC. Prove that ?EDF ? ?ECF.
What will be an ideal response?
Answers will vary. A sample correct response would be as follows.
and hence as 
by the SAS similarity property we have 
It follows that 
and so 
and 
are parallel. Thus 
Moreover, 
and 
by the SAS property, 
and so 
Mathematics
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