Iron Triangle, Richmond, California Iron Triangle of the Vietnam war era.) Residents are attempting to reverse this image in a number of ways. One of these is the new East Bay Center for the Performing Arts (completed in 2011) at MacDonald and 11th St, which contains the aptly-named Iron Triangle Theater. Iron Triangle, Richmond, California The Iron Triangle, sometimes known as Central Richmond, is a neighborhood in Richmond, California. It is a largely residential area but includes the downtown Richmond business district along Macdonald Avenue. Commercial areas on Cutting Boulevard and near Interstate 580 are also in the neighborhood if the more extensive of
Triangle their internal angles, measured here in degrees. A triangle that has two angles with the same measure also has two sides with the same length, and therefore it is an isosceles triangle. It follows that in a triangle where all angles have the same measure, all three sides have the same length, and such a triangle is therefore equilateral. Triangles are assumed to be two-dimensional plane figures, unless the context provides otherwise (see Non-planar triangles, below). In rigorous treatments, a triangle is therefore called a "2-simplex" (see also Polytope). Elementary facts about triangles were presented by Euclid in books 1–4