Length of the sides of square = 28 cm

Area of square = a² = 28² cm²

= 784 cm²

Since, all the circles are identical so, they have same radius

Let the radius of circle be R cm

From the figure 2R = 28 cm

R = 28/2 cm

R = 14 cm

Quadrant of a circle subtends 90° at the centre.

Area of quadrant of circle =

= 22/7 × 14 × 14 × 90°/360° cm² = 154 cm²

Area of 4 quadrants of circle = 154 × 4 cm² = 616 cm²

Area of shaded region = Area of square – Area of 4 quadrants of circle

= 784 cm² – 616 cm²

= 168 cm²