Construction of an equilateral triangle, hexagon and dodecagon in a given circle, view of the Hungarian town and fortress Keopczin, 1698
Date: 1698. Dimensions: 17,3 x 11,4 cm. Medium: copper engraving print on paper. Collection: Deutsche Fotothek.
Author: Anton Ernst Burkhard von BirckensteinSource: https://commons.wikimedia.org/Loading...