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concentric circle problem

I have no idea how to solve this. I love geometry, but I've found that I'm not very naturally good at it. please help!

The circles in the figure I have drawn out are concentric. The chord AB is tangent to the inner circle and has a length of 12 cm. What is the Area of of the non-shaded region? (A of big triangle - A of small triangle)

Attachment 28090

Re: concentric circle problem

Quote:

Originally Posted by

**aaronrpoole** The circles in the figure I have drawn out are concentric. The chord AB is tangent to the inner circle and has a length of 12 cm. What is the Area of of the non-shaded region? (A of big triangle - A of small triangle)

Attachment 28090

As posed, I fear there is no unique answer to this question.

Look at this webpage.

I think that you need to know the radius of one of those two circles. Or some other term from that webpage.

Re: concentric circle problem

Re: concentric circle problem

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