with compass and straightedge or ruler. An equilateral triangle is one
with all three sides the same length. It begins with a given
which is the length of each side of the desired equilateral triangle.
It works because the compass width is not changed between drawing each side, guaranteeing they are all
(same length). It is similar to the
60 degree angle construction, because the
of an equilateral triangle are all 60 degrees.