Suppose $A$ is inversely proportional to the square of $B$, and $A = 2$ when $B = 4$.

1. Find the constant of proportionality.
   help (numbers)
   
   
2. Write the formula for $A$ in terms of $B$.
   help (equations)
   
   
3. Use your formula to find $A$ when $B = 6$.
   $A =$ help (numbers)