Given:
The dimensions of a box are 3ft, 3ft and 13 ft.
To find:
The length of the longest flagpole that could be shipped inside the box.
Solution:
We know that the length of longest flagpole that could be shipped inside the box is equal to the length of the diagonal.

Where, l is length, b is breadth and h is height.




Therefore, the longest flagpole that could be shipped is about 13.67 feet long.