Answer: The answer is 24.
Step-by-step explanation: Given that the base of a prism is a 12-sided polygon. We are to find the number of vertices of the prism.
We know that a prism having base as n-sided polygon has 2n vertices, (n+2) faces and 3n edges.
Here, n = 12.
Therefore, number of vertices = 12 × 2 = 24,
number of faces = 120+ 2 = 14
and
the number of edges = 12 × 3 = 36.
Thus, the number of vertices of the prism is 24.