22) what is an arena stage (also called theater-in-the-round)? advantages and disadvantages?

An arena stage is a form of the platform in which the area where the actors perform is placed in the center of the audience.

An advantage of this type of stage is that, as it placed in the center all the audience can have a good look at what is happening there.

A disadvantage of the arena stage is that if the play is not prepared properly to be acted in those types of stages some parts of the audience would be seeing the play from the back.

Explanation:

It is also known as theater in the round and it can be traced up to the ancient Greek rituals which then evolved to Greek theater. In this type of stage, the audience surrounds the actors, who perform the play in an acting area at floor level.

I hope this answer helps you.