Triangular spider web

In this rectangular window frame, a spider begins to weave its web. The basic framework consists of three threads, which start from points A,B,A, B, and CC and are glued together at point D.D.

What is the length lAl_A of the first thread in centimeters?

Assumptions: Without tension, all threads have the same length, but they are stretched many times their original length. Thus, the tension force FikliF_i \approx - k l_i acting along a thread is approximately proportional to its total length lil_i . While the lengths lil_i of the threads can be different, the spring constant kk is the same for all threads. Apart from the tension, no further forces act on the spider threads.

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