By A Mystery Man Writer
This page shows how to construct (draw) a 45 degree angle with compass and straightedge or ruler. It works by constructing an isosceles right triangle, which has interior angles of 45, 45 and 90 degrees. We use one of those 45 degree angles to get the result we need. See the proof below for more details. A Euclidean construction.
Constructing 30deg Angle, PDF, Triangle
Construct a 45 Degree Angle Using Compass
Straightedge and compass construction - Wikipedia
Printable instructions for drawing a 45 degree angle with compass and straightedge or ruler
Construction
How can we divide a right angle into five equal parts with ruler and compass? - Quora
parallelUniverses [licensed for non-commercial use only] / Digital Compass and Straightedge
How to construct (draw) an equilateral triangle with compass and straightedge or ruler - Math Open Reference
PDF) The Possibility of Angle Trisection (A Compass-Straightedge Construction) Kimuya M Alex