A circular room in commercial buildings or out buildings is called a round house, in a private house it can be called among other things a turret. A rotunda is a round building or a room in a building, the central hall in the Capitol Building in Washington DC is an excellent example of a rotunda ( round room).
side of a building called
There is no building called The PolygonBuilding.The US Department of Defense is headquartered in The Pentagon Building.
I'd call it a triangular building but the answer you are looking for is pyramid but that is NOT what a triangular building is called.
malleolus
A circular room in commercial buildings or out buildings is called a round house, in a private house it can be called among other things a turret. A rotunda is a round building or a room in a building, the central hall in the Capitol Building in Washington DC is an excellent example of a rotunda ( round room).
A roof that overhangs its supporting wall could be called Eaves or a Gable, depending on which aspect of the building it is on. On the ends of a building it is called a Gable, whereas on the sides it is called the Eaves. "Eaves" also applies to buildings with no perceivable ends or sides; a round building for instance.
round room
Capitol records.
A building with a round roof, like the Capitol building in Washington DC or Saint Paul's cathedral in London.
Rondavel
side of a building called
round and round is on the album called a year without rain
Silo
The rotunda building
Rotunda
Hearthome City, the round building.