A curved roof is a type of roof that has a curved shape instead of a flat one. The most common types of curved roofs are domes, pagodas, and arcs. A DOME is a curved roof that is usually round or oval in shape and is supported by a wall or columns. A PAGODA is a type of curved roof that is typically multi-tiered and has an ornamental design. An ARC is a curved roof that is usually semi-circular in shape and is supported by a wall or columns.