De Architectura, Book V, Vitruvius

De Architectura, Book V: Chapter V, Paragraph 7: "... all our public theatres made of wood [omnia publica lignea theatra] contain a great..."
De Architectura, Book V: Chapter V, Paragraphs 1-3: Plan of the Theatre: "The plan of the theatre itself is to be constructed as follows. Having fixed upon..."

Book VII of De Architectura concerns civil architecture.