Remember this problem? The one where you had to find the area between two circles by only knowing the length of the tangent "chord" (the red line)?

That problem is solved using some (moderately) tricky geometry. But if you know that the problem is solvable, it's actually pretty easy to solve by simply using the formula for the area of the circle and a bit of logic.

Can you do it?

That is the solution to the original question. The question here is whether, by knowing that there is a single solution, you can simplify the problem, and thus also the math.

Posted by TomM on 2002-05-10 18:26:10