The sum of two sides must be greater than the third.
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The answer depends on the information that you have: it could be the sine rule or the cosine rule.
Using the cosine rule: 13.0112367 cm The triangle is in fact an isosceles triangle.
A triangle has 3 sides. The sum of any two sides must be larger than or equal to the length of the third side, and the difference of any two sides must be less than or equal to the length of the third side.
By using the cosine rule in trigonometry the third side works out as 7.97cm rounded to 3 significant figures.
The minimum third side length of a triangle having one side of 11 and another side of 5 is 6.