Can someone help me prove this is a square? Please show all necessary work I paid a lot for this question

Answer:
[tex]ab = \sqrt{{2}^{2} + {6}^{2}} \\ ad = \sqrt{{2}^{2} + {6}^{2}} \\ bc = \sqrt{{2}^{2} + {6}^{2}} \\ cd = \sqrt{{2}^{2} + {6}^{2}} \\ [/tex]
AB=AD=BC=CD => ABCD is square