Question 10 B
Julie is asked to prove that
AB – DC and
AD = BC on the parallelogram shown above. Her proof is shown below.
1
Step Statement
AB || DC and AD || BC by definition of a parallelogram
2 DB is a transversal therefore Zb - Zd and Za Zc
3
DB DB
4
A DAB AA BCD
5
AB-DC and AD BC
Which reason supports the statement she made in step 5 of her proof?

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