Is it possible to calculate the angle X, without knowing the upper angle value for blue triangle?
2026-04-02 19:53:07.1775159587
How to calculate this inside triangle angle?
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No, it is impossible with the given information because there are infinite possible blue triangles in the black triangle.
Consider the following diagram, for example.
New information, however, such as the side lengths of the blue triangle, could allow one to compute $X$.