How many diagonals do hexagonal prism have?

A hexagonal prism has 12 diagonals on the top hexagonal face and 12 diagonals on the bottom hexagonal face, totaling 24 diagonals in the two hexagonal bases. Additionally, there are 6 vertical diagonals connecting the corresponding vertices of the top and bottom faces. Therefore, the total number of diagonals in a hexagonal prism is 30.