How many units apart is any pair of parallel sides of a regular hexagon with side of 6 units? Express your answer in simplest radical form.
<|im_start|>system
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<|im_start|>user
How many units apart is any pair of parallel sides of a regular hexagon with side of 6 units? Express your answer in simplest radical form.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
6\sqrt{3}
How many units apart is any pair of parallel sides of a regular hexagon with side of 6 units? Express your answer in simplest radical form.
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