Consider the picture to the right. We have two concentric circles, one inside another. We do not know the radius for either one of them.

We do, however know that the chord (shown in red) - a line whose ends are on the outer circle and which is tangent to the inner circle - has a length of 10 inches.

What is the area (shaded in light-blue) between the two circles?

(In reply to by )

Hey CeeAnne,

When someone submits a problem, s/he usually also submits the solution along with it.  This is typically refered to as "the official solution" by the author.

When the problem gets posted, the solution does not appear for a while.  Others will post comments, some containing solutions.  The problem might still say "no solution yet" even though several people have posted correct solutions.  This is because it is referring to the official solution (by the author).

After some time (varies) the official solution will be posted and the link will say "See the solution."  Sometimes the author will like other people's solutions and add them to the official solution (like they'll post links to other people's comments.)  Sometimes that doesn't happen just because =)

I hope that answers your question!

Posted by nikki on 2004-10-05 07:44:36