Bisecting an Angle with a Two-Edged Ruler
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This Demonstration shows how to bisect an angle using a ruler that has two parallel edges.
Contributed by: Izidor Hafner (July 2017)
Open content licensed under CC BY-NC-SA
 B. I. Argunov and M. B. Ball, Elementary Geometry (in Russian), Moscow, 1966 pp. 338–339.
"Bisecting an Angle with a Two-Edged Ruler"
Wolfram Demonstrations Project
Published: July 28 2017