In the accompanying proof, the reason (5) is SAS theorem.
In the given question,
Given: AB || DC
AB=DC
Prove: m∠DAC = m∠BCA
The statement used to prove this conditions are:
Statement Reason
AB || DC (1) Using the Quadrilateral Rule
AB=DC (2) Opposite sides are equal
m∠BAC = m∠DCA (3) Alternate interior angles Theorem
AC=AC (4) Common Side
∆ADC≅∆CBA (5) SAS Theorem
m∠DAC = m∠BCA (6) Alternate interior angles Theorem
We have to explain in the accompanying proof, what is reason (5).
So, in the accompanying proof, the reason (5) is SAS theorem.
In the proving we first prove one side equal, then angle equal and at last again one side equal.
To learn more about SAS theorem link is here
brainly.com/question/22472034
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