(I.23) Construct a Duplicate Angle, Proof

Support my channel with this special custom merch! https://www.etsy.com/listing/994053982/wooden-platonic-solids-geometry-set Learn this proposition with interactive step-by-step here: coming soon In proposition 23 of Euclid's Elements, we prove that on any line we can always duplicate any angle. Playlist of Euclid's Elements in link below: http://www.youtube.com/playlist?list=PLFC65BA76F7142E9D