An elongated cupola is a polyhedral structure that combines the features of a cupola and a prism. In geometry, a cupola is typically formed by taking a polygon and connecting its vertices to a single point above the polygon (the apex), resulting in a structure with a base that is a polygon and lateral faces that are triangles. In the case of an elongated cupola, the basic structure is elongated by adding an additional layer of polygonal faces at the top.
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