Organization of geometry

First, I have studied Geometry in the past.  I'm a software engineer.  I recently decided to review some advanced math concepts just for fun and to sharpen my mind a bit.  There is one thing that I...

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Geometry - Vertical Angles

I recently finished watching the video, Vertical Angles within the section, https://www.khanacademy.org/math/geometry/hs-geo-foundations The issue is that near the end of the video the author still...

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