A nonagon is nine sided. So, the base would have 9 sides and each face would be triangle.
18 edges would be my answer.
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A pyramid with 18 edges would be called a nonagonal pyramid. A prism with 18 edges is called a hexagonal prism.
There are 10 sides : 9 sides and the nonagonal base.
Ah, a nonagonal pyramid is a beautiful shape! It has 9 vertices, one at the top where all the edges meet, and 8 at the base where the sides come together. Each vertex is like a little friend, all coming together to create a wonderful geometric masterpiece.
Edges: 27 Faces: 11 Vertices: 18
16 edges- the edges of the base, and the edges leading to the point of the pyramid.