To find the slant height of a square pyramid, you typically need to know the height of the pyramid and the length of one side of the base.
The slant height (\( l \)) can be found using the Pythagorean theorem. The formula is:
\[ l = \sqrt{\left(\frac{s}{2}\right)^2 + h^2} \]
where:
- \( s \) is the length of a side of the base square,
- \( h \) is the height of the pyramid.
If you have specific values for \( s \) and \( h \), please provide them, and I can help calculate the slant height.