The volume of a square pyramid is given by
V =(1/3)* pi * s^2* h where s is the side length and h is the height......so we have
1024 = (1/3) (3.14) (s^2) (12) simplify
1024 = 12.566 * s^2 divide both sides by 12.566
1024 / 12.566 = s^2 take the positive root of both sides
s = 9.03 inches