A raked stage refers to:

a
A sunken area located between the stage and the first row of the audience seating.
b
The large arch or rectangular opening between the stage and the audience seating area.
c
A stage design with a gentle incline from the apron towards the back of the stage, allowing for better visibility for audience members seated further back.
d
The area of the stage farthest from the audience.

c

A stage design with a gentle incline from the apron towards the back of the stage, allowing for better visibility for audience members seated further back.