Step 1: Concept Understanding:
This query seeks the definitions of terms related to ancient Indian theatre structure as outlined in the Natyashastra.
Step 2: Detailed Explanation:
The Natyashastra details architectural plans for a theatre ('Natyamandapa').
- Ranga-bhumi or Ranga-pitha denotes the stage floor where performances occur.
- Ranga-mandala signifies the entire stage area or the stage-house, also termed Rangsala.
- The spectator seating area, the auditorium, is known as Preksagriha (or Preksagrah).
The question asks for the combined meaning of `Ranga-bhumi` and `Ranga mandala`. This combination represents the entire performance space, including the stage and the larger structure containing the auditorium. Consequently, 'Rangsala' (stage-house) and 'Preksagrah' (auditorium) accurately describe the complete theatrical environment.
Step 3: Final Answer:
These terms collectively refer to the Stage-house (Rangsala) and the Auditorium (Preksagrah).