Answer :

Triangles with the provided side lengths of 3.5, 3.5, and 9 cannot be formed.

According to the Properties of triangle, the length of the third side of a triangle must be greater than the sum of any two of a triangle's sides.

Given the side lengths are 3.5, 3.5 and 9;

Sum of two sides = 3.5 + 3.5 = 7 cannot exceed 9

Thus, it is clear that a triangle cannot be formed using the specified side lengths of 3.5, 3.5, and 9.

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