Find the largest the inner circle can be, defined by the 20 foot chord, which is inside a 20x20 square. That defines the largest the outer circle can be. 100pi is the difference between them. The smallest the inner circle can be is the center of a circle with a 20 foot diameter, which has a 314 square foot area, or 100pi. All circles in between have the same ratio in their differences of area.
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.