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Constructing an Angle of 90 degrees
How to construct an angle of 90° (using just a straightedge and compass, without a protractor)?Find the answer in this video.Construction on paper.Video without words.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/ .My math materials in English: http://www.antonija-horvatek.from.hr/~ahorvate/materials-English.htm .My (whole) website: http://www.antonija-horvatek.from.hr/ .
