Final answer:
The ancient Egyptian tomb described is referred to as a mastaba. Mastabas were rectangular in plan with a flat roof and sloping sides, made of mud brick, and had underground burial chambers.
Step-by-step explanation:
The ancient Egyptian tomb described in the question is referred to as a mastaba. Mastabas were rectangular in plan with a flat roof and sloping sides. They were made of mud brick and had a shaft that led to underground burial and offering chambers. The architect Imhotep later developed the step pyramid tomb based on the mastaba design.