1.

If the length of the diagonal of a square Is 20 cm, find its perimeter.

A. \[20\sqrt{2}\,cm\]                   
B. \[30\sqrt{2}\,cm\]       
C.      \[40\sqrt{2}\,cm\]           
D.     \[50\sqrt{2}\,cm\]                   
Answer» D.     \[50\sqrt{2}\,cm\]                   


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