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Constructing an Angle of 90 degrees

Constructing an Angle of 90 degreesУ вашего броузера проблема в совместимости с HTML5
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/ .
Опубликовано: 03-06-2013
Теги: antonija horvatek matematika osnovna škola svijet matematike construction construct angle angle of 90° 90 degrees right angle right angle construction geometry video without words

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