Why Are the Mentioned Triangles Similar in the Explanation?

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The discussion centers on the similarity of isosceles triangles as explained through their angles. It is established that the triangles are similar due to having equal angles at the center of the circle. This geometric principle confirms that isosceles triangles with a shared central angle maintain similarity, reinforcing foundational concepts in Euclidean geometry.

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Why in the provided explanation the mentioned triangles are similar?
Thanks in advance
 

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The angle is chosen in such a way that they are. (they are isosceles triangles, they are similar if the angle at the center of the circle is the same).
 
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