What is a Arena Theatre?

answers1: An Arena theatre is where the audience completely surrounds
the stage or playing area. It often called "Theatre-in-the-round"
because the stage is always in the center with the audience arranged
on all sides (4 sides). An Arena theater shapes can be rectangular,
circular, diamond, or triangular, with actors entering and exiting
through the audience from different directions or from below the
stage. The stage is usually on an even level with or lowered below the
audience in an arena formation.
answers2: an Arena Theater is one of the oldest theaters in
Bratislava. It was established in 1828 on the right bank of Danube.