The perpendicular bisector of a line segment is the line which is perpendicular to a given line segment and which divides it into two equal line segments.
How to construct the perpendicular bisector of a line segment (by using just a straightedge and compass, without a triangle)?
Find the answer in this video.
Construction on paper.
Video without words.
My math materials in English: http://www.antonijahorvatek.from.hr/... .
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Thanks to Rex Boggs, Rockhampton Grammar School, Australia (http://bit.ly/rexboggs ) for help with the English translation.
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Similar words:
Bisecting a line segment.