The area of a circle is given by the formula A = πr^2, where r is the radius of the circle. Since the diameter of the sweet potato pie is 10 inches, the radius is half of that, or 5 inches.
The area of the whole pie is:
A = πr^2 = π(5 in)^2 ≈ 78.54 in²
Since the pie is cut into 8 equal slices, each slice would have an area of:
A/8 ≈ 78.54 in² ÷ 8 ≈ 9.82 in²
Rounding this to the nearest square inch gives:
10 in²
Therefore, the answer is B. 10 in² (to the nearest square inch).