How big of an area is a circle with a diameter of 21 feet? Enter the dimensions in feet and inches and the calculator will show the area
in square feet, meters, inches, and acres.
Calculate the area of a rectangle
Input the diameter
Use this to calculate the area of a circle with a width of 21 feet. Type in the diameter and it
will show the area. Use it to calculate the area of a lake, cul de sac, mirror, rug, patio, swimming pool, island, or
any circular area.