A pyramid is a structure whose outer surfaces are triangular and converge to a single step at the top, making the shape roughly a pyramid in the geometric sense. The base of a pyramid can be trilateral, quadrilateral, or of any polygon shape. As such, a pyramid has at least three outer triangular surfaces.
Egypt Publicly opens King Sneferu's Bent Pyramid

Egypt opens King Sneferu's Bent Pyramid to public

Many people gathered at an inaugural ceremony in front of the Bent Pyramid of King Sneferu in Dahshur, south of Egypt's capital Cairo, on July 13, 2019, as the ancient royal necropolis started to open for tourism.

Measuring 101 meters in height, the Bent Pyramid is one of three built for the first pharaoh of Egypt's Fourth Dynasty Sneferu, which can date back around 4,600 years. As the pyramids are opened, tourists will be able to walk along the 79-meter-long narrow tunnel inside the pyramid and witness the newly-discovered collections, including clay and wooden sarcophagi, mummies and funerary masks.