we know that
[volume of a square pyramid]=area of the base*height /3
area of the base=3*volume/height
volume=245 in³
height=15 in
area of the base=3*245/15-------> 49 in²
the area of the base is a square
so
area=b²---------> b=√area---------> b=√49-------> b=7 in
the answer is
The length of one side is 7 in
