Brian Monetti, I <3 math!
To find out, you need to find the distance from one corner of the box to the opposite corner, and see if it is more than 34 inches. To do this, first draw the box out and label the corners you want to find the distance between. To find that distance, you will need to find the diagonal distance across one side of the box from one of the labeled corners, and then the diagonal distance between the two labeled corners along the plane created by the line you just drew and edge of the box leading to the next corner.
To find the length of these diagonals, you will need to use the Pythagorean Theorem, which this video can help with: https://www.noodle.com/learn/236938/introduction-to-geometry-10-right-triangles-pythagorean-theorem