Question 31
In this diagram, not drawn to scale, figures $\mathrm{I}$ and $\mathrm{III}$ are equilateral triangular regions with respective areas of $32\sqrt3$ and $8\sqrt3$ square inches. Figure $\mathrm{II}$ is a square region with area $32$ square inches. Let the length of segment $AD$ be decreased by $12\dfrac12\%$ of itself, while the lengths of $AB$ and $CD$ remain unchanged. The percent decrease in the area of the square is:
