The diagram shows a square of side 7 cm with two quadrants drawn inside. Find the area of the shaded region. (take pi = 22/7)

The area of the shaded region:

A = r ² π - a²

where: r = d/2 = 7√2 / 2

A = (7√2 / 2) ² · 22/7 - 7²

A = 49 · 2 / 4 · 22/7 - 49

A = 49/2 · 22/7 - 49

A = 7 · 11 - 49

A = 77 - 49

Answer: A (shaded) = 28