Question 1164859
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How can I guess from your post, who are these a1, a2, x1 and x2, BR and BS ?


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As I see from your post, you have no idea and have no experience on how a Geometry problem should be formulated.


The full description of the major figure must go first.


Then the full description/descriptions of all relevant elements must be placed.


Only after that the question is formulated.