The area of a circle is 121π in². What is the circumference, in inches? Express your answer in terms of π.
The formula for the area of a circle is given by A = πr^2, where A is the area and r is the radius of the circle.
In this case, we are given that the area is 121π in². Thus, we have 121π = πr^2.
Dividing both sides of the equation by π, we get r^2 = 121.
Taking the square root of both sides, we find that r = 11.
The formula for the circumference of a circle is given by C = 2πr, where C is the circumference and r is the radius of the circle.
Substituting in the value of r we found earlier, we have C = 2π(11) = 22π.
Therefore, the circumference of the circle is 22π inches.