Final answer:
The diagonal length of the package is approximately 17.32 inches.
Step-by-step explanation:
The diagonal length of a cube can be found using the formula: diagonal = √3 * side length.
In this case, the height of the package is given as 10 inches, which is the same as the side length of the cube. Therefore, the diagonal length of the package is √3 * 10 inches, or approximately 17.32 inches.
So, the diagonal length of the package is 17.32 inches.