What is the circumference of a circle that is 4 ft?

Well, isn't that just a happy little question! To find the circumference of a circle, you can use the formula C = 2πr, where r is the radius of the circle. Since the diameter is twice the radius, if the circle has a diameter of 4 feet, the radius would be 2 feet. Plugging that into the formula, the circumference would be 4π feet.