Considering that it is a triangle, the range of the possible lengths, x, of the third side of the tile is: (1, 17).
In a triangle, the sum of the lengths of the two smaller sides has to be greater than the length of the greater side.
Hence, if 9 is the greater side:
8 + x > 9
x > 1.
If 8 and 9 are the smaller sides:
x < 8 + 9
x < 17.
Hence the range of possible lengths is:
(1, 17).
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