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The area of a circle is 36 square centimeters.

What is the length of its diameter, in centimeters?

$ \cfrac { 6\sqrt { \pi } }{ { \pi } } $

$ \cfrac { 12\sqrt { \pi } }{ { \pi } } $

$ \cfrac {36}{ { \pi } } $

$ {12} $

$ {12\pi} $