Constructing an Angle of 120 degrees

How to construct an angle of 120° (using just a straightedge and compass, without a protractor)?
Find the answer in this video.
Construction on paper.
Video without words.
My math materials in English: http://www.antonija-horvatek.from.hr/... .
My (whole) website: http://www.antonija-horvatek.from.hr/ .
Thanks to Rex Boggs, Rockhampton Grammar School, Australia (http://bit.ly/rexboggs ) for help with the English translation.
Music by longzijun, http://longzijun.wordpress.com/ .
Terms of use allow for free use in monetized YouTube videos: https://longzijun.wordpress.com/music... .

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