Any number greater than or equal to 4.
A polyhedron is a generic term meaning a [3-dimensional] shape with many plane sides. There are some other requirements also, but the point is that the term does not specify how many sides or vertices.
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The number of edges and vertices ina polyhedron will depend on the polyhedron one selects either to study, build or etc...
It has 6 vertices.
A diagonal of a polyhedron is a line between any two vertices except outer vertices.
6
a trapezoid has 4 vertices