A triangle has vertices at coordinates $(11,1)$, $(2,3)$ and $(3,7)$.  What is the number of units in the length of the longest side of the triangle?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A triangle has vertices at coordinates $(11,1)$, $(2,3)$ and $(3,7)$.  What is the number of units in the length of the longest side of the triangle?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
10
A triangle has vertices at coordinates $(11,1)$, $(2,3)$ and $(3,7)$.  What is the number of units in the length of the longest side of the triangle?
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