In Graecorum theatris non omnia isdem rationibus sunt facienda, quod primum in ima circinatione, ut in latino trigonorum iiii, in eo quadratorum trium anguli circinationis lineam tangunt, et cuius quadrati latus est proximum scaenae praeciditque curvaturam circinationis, ea regione designatur finitio proscaenii.
In the Greek theatres some things are done differently. Firstly, in the orchestra, the angles of three squares touch the circumference, whereas in the Roman theatre we have the angles of four triangles. In the Greek the line of the proscenium (or stage) is drawn along the side of the square which is nearest to the scenery, where it cuts the circumference.
final_alignments\Vitruvius_Architecture_Book_5.json