First let's find the total area of the pie.
Area = pi x r^2
A = 3.14 x 4.5^2
A = 63.585 in^2
Now let's look at how much was eaten. If Tina cut the pie into 8 slices, and 3 people ate a slice of pie, then 3/8 of the pie was eaten meaning that 5/8 of the pie remains.
5/8 x 63.585 = 39.7in^2
This rounds to 40in^2 which is answer choice C.
