How to construct a 60 degree angle with compass and straightedge or ruler - Math Open Reference

This page shows how to construct (draw) a 60 degree angle with compass and straightedge or ruler. This construction works by creating an equilateral triangle. Recall that an equilateral triangle has all three interior angles 60 degrees. We use one of those angles to get the desired 60 degree result. See the proof below for more details. A Euclidean construction.

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