It is the square root of: (-1-11)2+(6-1)2 = 13 units of length
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1 5/6 = (1×6+5)/6 = 11/6 → 1/(1 5/6) = 1/(11/6) = 6/11
The ratio of 6 to 22 is 3 to 11. That is the lowest that this fraction can be broken down to.
-6/11 ÷ 6 = -1/11
11
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