Which could not be the length of the unknown side of the triangle? A. 12
B. 14
C. 15
D. 18

All of them

Step-by-step explanation:

All the listed answers are greater than the side marked 11.  I don't know if this drawing is to scale, but even the answer 12 if you would make the triangle into two smaller right triangles from the vertex of angle ? and 6 to the side marked 11  

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step-by-step explanation:

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