How to bisect an angle with compass and straightedge or ruler. To bisect an angle means that we divide the angle into two equal (congruent) parts without actually measuring the angle. This Euclidean construction works by creating two congruent triangles. See the proof below for more on this.
Bisection - Wikipedia
作図メモ：三角形の1辺と平行な線分 - okamoto7's blog
Printable instructions for constructing a square of a given side
geometry - How to give my students a straightedge instead of a
Angle - Wikipedia
How to Bisect a Line With a Compass and Straightedge: 9 Steps
Bisection - Wikipedia
Help with angles - noob with miter cuts., Page 3
How can we divide a right angle into five equal parts with ruler
Printable step-by-step instructions for adding two angles with
The Following Are The Steps in Constructing Perpendicular Bisector
Finding the center of a circle or arc with compass and
Angle Trisection: Jump To Navigation Jump To Search
Geometry: How do you bisect an angle? - Quora
