Answer:
Option 1
Explanation:
ABCD is a parallelogram, Julie wants to prove that ABCD is also a square.
Remember that a parallelogram has opposite sides equal.
So,
AB ≅ CD
AD ≅ BC
The 4 triangles are congruent. The bases of the triangles are vertically opposite to each other and are congruent. We can use the definition of a parallelogram to prove AB ≅ BC.