How to construct a 30 degree angle with compass and straightedge or ruler - Math Open Reference

This page shows how to construct (draw) a 30 degree angle with compass and straightedge or ruler. It works by first creating a rhombus and then a diagonal of that rhombus. Using the properties of a rhombus it can be shown that the angle created has a measure of 30 degrees. See the proof below for more on this. A Euclidean construction.

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