The formula f(x)= x2 can be used to find the area of a circular rug, where x is the length…

The formula f(x)= x2 can be used to find the area of a circular rug, where x is the length of the radius. If the area is greater than 78.5 ft2, but less than 314 ft2, what is the domain of the function? (Use 3.14 for .)