Proving the single opposite side pair theorem

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

Acomposition of transformations maps δxyz to δx"y"z". the first transformation for this composition is , and the second transformation is a 90° rotation about point x'.

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?