3. Determine the area of the shaded design

Calculate the area of the shaded design in the below figure, where \(ABCD\) is a square of side 7 \(cm\) and semicircles are drawn with each side of the square as diameter. (Use \(π = 3.14\))

 

 

The area of the shaded design \(=\) ________\(cm^2\).