The layout of a gothic dome base. Geometry and construction of the octagon in the Guarç’s Gothic layout (c. 1345–1380)

The study of the Gothic layout of Guarc (c.1345–1380) through its imprints allows the determination of the methodology of its outline. The outline of the octagon dome is determined by the geometric method of design. At the same time, the proportional theory that exists behind the parchment allows the transport of the project to the site using simple metrological arithmetic operations.