Wow! The channel “Freedom Mathematics” did a general case of the chord progression puzzle. The general problem is quite complicated! I hope everyone checks out this video! (there are English subtitles at the beginning–then you can follow the equations). See: https://youtu.be/5i_y3KEiPHE
Source
[High School Math: Geometry] How do I solve for the length of the chord x? Not able to visualise the hint. from HomeworkHelp
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