Make clear the sector area first: s fan =4? ×3. 14×? = 12.56(cm？ )

Then subtract the square area to get the sector area: S plus -S fan =4? - 12.56=3.44(cm？ )

Then, subtract the area of the circle from the square: s plus -s circle =4? -3. 14×2? =3.44(cm？ )

Then, from the meaning of the question, we can know that the four blocks of the figure after subtracting the area of the circle from the square are all equal.

As shown in the figure:

These four shaded parts are the same.

Then the area of each block is: (S positive -S circle) =3.44÷4=0.86(cm? )

Finally, subtract the area of the circle from the square and subtract one of the shaded parts.

Then: 2(3.44-0.86)=5. 16(cm? )

I'm glad to answer your question.