How to copy an angle with compass and straightedge or ruler - Math Open Reference

Given an angle formed by two lines with a common vertex, this page shows how to construct another angle from it that has the same angle measure using a compass and straightedge or ruler. It works by creating two congruent triangles. A proof is shown below. A Euclidean construction

Constructing congruent angles - Geometry

作図メモ：三角形の1辺と平行な線分 - okamoto7's blog

Solved CONSTRUCTION: Copy and Bisect Segments and Angles A

How to Construct a 90 Degrees Angle Using Compass and Ruler

Printable instructions for constructing a square of a given side length with compass and straightedge or ruler

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Copying a triangle with compass and straightedge or ruler - Math Open Reference

Printable step-by-step instructions for adding two angles with compass and straightedge or ruler

Printable step-by-step instructions for adding two angles with compass and straightedge or ruler

How to construct an angle 90 with compass and straight edge or ruler

Level 1 - Compass and Straight Edge Constructions - Congruence, Proof, and Constructions (Geometry)

Constructions How to Copy An Angle

A geometric proof of the impossibility of angle trisection by straightedge and compass

How to Construct a 90 Degrees Angle Using Compass and Ruler