Construction of an equilateral triangle

also the basis of a number of geometric and trigonometric proofs.

There is a way to do this starting with the desired length of the side as well.

Man, I loved geometry in high school. Hated any other attempt at learning math.

@XYLENE IIRC You draw one side then draw 2 arcs from each end and where they intersect is the top point you draw the 2 lines to.