Sacred Geometry: A Primer

This week, the hemidiagon. It begins, as usual, with the square.

(I've drawn mine with the lines extended to save time.) Find the half way point on the top of the square.

You don't have to draw this next part but it is crucial to the demonstration. The dotted lines are what you'll need to set your compass to.

Put the point of the compass on the bottom left corner of the square and the lead on the marked halfway point. Arc out to the left.

Repeat in the opposite direction.

Draw the line across where the arcs meet the extended lines.