Let's use the side length of each square as 1 unit.
Looking at the image, the diameter of the circle is equal to 10 units.
The radius is equal to half the diameter, so the radius is equal to 5 units.
The area of the circle can be calculated with the formula below:
[tex]\begin{gathered} A=\pi r^2 \\ A=3.1416\cdot5^2 \\ A=3.1416\cdot25 \\ A=78.54\text{ u}^2 \end{gathered}[/tex]
Therefore the circle area is equal to 78.54 square units. Since the area of each square is 1 square unit, the number of squares inside the cookie is 78.54.
