What were the shapes of theatres?

* Circular: This was the most common shape for Greek and Roman theatres. The circular design allowed for good acoustics and sight lines, and it also made it easy to construct the theatre.

* Rectangular: Rectangular theatres were also common, especially in later Roman times. They were often built in urban areas, and they could seat a larger number of people than circular theatres.

* Semi-circular: Semi-circular theatres were a variation of the circular design. They were often used for smaller performances, such as recitals or plays.

* Irregular: Some theatres were built with irregular shapes. These theatres were often built on natural slopes or in other unusual locations.