It is a triangle inside another shape, usually such that its vertices are on the boundaries of the other shape.
Nonahedron
It is a triangular prism that has 6 vertices, 9 edges and 5 faces.
Since it has 9 faces it is a nonahedron. Not sure how many of the thousands of nonahedrons have 6 vertices.
A nonagon is a two dimensional; figure with 9 vertices.
A polygon with 9 vertices and 9 sides is a nonagon.
Vertices are the points on any shape. For example, A 2-dimentional square has 4 vertices.
nonagon
It is a triangle inside another shape, usually such that its vertices are on the boundaries of the other shape.
Vertices are on a shape when two sides meet up and create a corner. For example, a square has 4 vertices, a tringle has 3 vertices, a circle has no vertices. (singular is 'vertex').
Vertices are the corners in a shape. Lets start with a triangle, It has 3 sides and 3 vertices's. I hope this answers your question Jordan McNeill
Nonahedron
An octagonal pyramid
There can be no such shape.
pentagon
A triangular prism.
a triangular prism