Answer
$\frac{9}{2}$
Work Step by Step
Length of the longest side to the length of the shortest side
As per Values given
6$\frac{3}{4}$ ft to 1$\frac{1}{2}$ ft
6$\frac{3}{4}$ ft/1$\frac{1}{2}$ ft =6$\frac{3}{4}$//1$\frac{1}{2}$ ft
= (27/4)/(3/2)=27/4× 2/3= $\frac{9}{2}$