1 2 3 1 _ _ _ 2 _ _ _ 3 _ _ _ ACROSS 1) the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846... 2) a long thin fluffy scarf of feathers or fur 3) a quantity of money DOWN 1) a solution containing a phosphate buffer 2) an informal debt instrument; representing `i owe you' 3) a guided missile fired from land or shipboard against an airborne target ** Scroll down for solution. ** Are you sure you want to peek? pis boa sum