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Background to I 23 Construct A Duplicate Angle Proof

This is the twenty third proposition in Euclid's first book of The Elements. This Constructions can be confusing! In this video, I show you how to Constructions: How to Construct a Duplicate to an Angle. Part of our "Workshop Geometry" series for solving geometry problems in the woodworking shop using only a compass and ruler.
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(I.23) Construct a Duplicate Angle, Proof
Euclid's Elements Book 1: Proposition 23, Constructing An Angle
How to Copy an Angle - Geometry Constructions
Copy an angle construction
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Last Updated: May 27, 2026
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