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Decagonal Intersection Delight (Posted on 2024-04-22) |
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You are given a regular decagon A1A2... A10. Let A be the intersection point of lines A1A4 and A2A5, B is the point of intersection of lines A1A6 and A2A7, and C is the point of intersection of lines A1A9 and A2A10. Find the angle of ABC.
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