Final answer:
Due to the lack of specific information on the setup of the similar triangles and the provided lengths, we cannot determine the missing length y using geometric calculations or ratios.
Step-by-step explanation:
The question requires finding the missing length y in similar triangles.
To determine this length, a ratio or a proportion based on the similarity of triangles must be used. The provided information suggests this is related to geometric calculations, likely involving right triangles, the Pythagorean theorem, and trigonometric functions such as tangent.
Unfortunately, the provided information is fragmented and does not give a clear setup of the similar triangles, the specific lengths provided, or the ratios required for calculation.
Therefore, we cannot provide a step-by-step solution to find the value of y.