A1. Each of the squares $A B C D$ and $E F G H$ with side length 1 is divided into congruent smaller squares, in which circles are inscribed, as shown in the figure. What is the ratio of the areas between the shaded part of square $A B C D$ and the shaded part of square $E F G H$?
(A) $\frac{9}{16}$
(B) $\frac{3}{4}$
(C) 1
(D) $\frac{4}{3}$
(E) $\frac{16}{9}$

![](https://cdn.mathpix.com/cropped/2024_06_07_4050f14f84cf4f327f67g-02.jpg?height=334&width=517&top_left_y=770&top_left_x=1403)
A1. The ratio of the area of a circle inscribed in a square is $\frac{\pi}{4}$. In square $A B C D$, each of the nine congruent smaller squares has a shaded area ratio of $\frac{\pi}{4}$, so square $A B C D$ also has a shaded area ratio of $\frac{\pi}{4}$. The same applies to square $E F G H$. Therefore, the ratios of the shaded areas are equal.