Curved, the edge is the on the opposite side of the tip.
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Curved.
A cone?
The geometrical object known as a cone has no planar faces, two curved surfaces, no edges and one vertex. A "real" object often called a cone is a portion of a half cone. That has one base, a curved surface, and one vertex.
It has a flat base, a curved surface area, a circular edge and one vertex.
a cone