- In classical geometry, a radius (pl.: radii or radiuses) of a circle or sphere is any of the line segments from its center to its perimeter, and in more modern usage, it is also their length. The name comes from the Latin radius, meaning ray but also the spoke of a chariot wheel. The typical abbreviation and mathematical variable name for radius is R or r. By extension, the diameter D is defined as twice the radius
- Fritz Lang and METROPOLIS (german-way.com)
The man born Friedrich Christian Anton Lang in Vienna on 5 December 1890 claimed to have studied art and architecture in Vienna, Munich, and Paris. But according to biographer Patrick McGilligan (Fritz Lang: The Nature of the Beast), this was just one of several Fritz Lang legends that the director carefully cultivated over the years. In reality, Lang dropped out of Vienna’s Technische Hochschule (technical college) after only two years.