⇒ Area of 4 sectors =4×θ360oπr2
⇒ Area of 4 sectors =4×90o360o×3.14×(1)2
∴ Area of 4 sectors =4×3.14×14=3.14cm2
⇒ Area of circle =πr2=3.14×(1)2=3.14cm2
⇒ Area of a square =a2=(4)2=16cm2
⇒ Area of shaded region = Area of square - (Area of 4 sectors + Area of circle)
⇒ Area of shaded region =16−(3.14+3.14)
∴ Area of shaded region =16−6.28=9.72cm2