What is the circumferene of 21' pool?

To find the circumference of a pool with a diameter of 21 feet, you can use the formula for circumference, which is C = π × d. Plugging in the diameter: C = π × 21 feet. This gives you approximately 66.0 feet when using 3.14 for π. Thus, the circumference of a 21-foot pool is about 66 feet.