Their both the answer hope this helps
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Answer:
9. A. One - to - One Correspondence
10. D. None of the above
So lets ABCD are the sides of the square and AB=CD, AC=BD and the Angle ABC = 90 so therefore by making a diagonal we can use the SAS or SSS congruency for two triangles, so we can prove two triangles are equal and that is why the shape is square.
