Area of each of the 4 sectors is equal to each other and is a sector of 90° in a circle of 7 cm radius.
Area of each sector =
= 1/4 x 22/7 x 7 x 7
=77/2 cm2
Area of square ABCD = (Side)2 = (14)2 = 196 cm2
Area of shaded portion = Area of square ABCD − 4 × Area of each sector
= 196 - 4 x 77/2 = 196 - 154
=42 cm2
Therefore, the area of shaded portion is 42 cm2.