10 I think?
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Sorry, but you think wrong. There are 20.
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By "corners", do you mean vertices or edges?
Twenty edges
20 edges, 11 vertices (corners) and 11 faces.
There are actually more than a pyramid that have that number of edges. Pentagonal star pyramid has 20 edges. Decagonal pyramid is another one.
Vertices: 20 Edges: 30 Faces: 12