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Concentric Circles and a Chord (Posted on 2023-07-19) Difficulty: 3 of 5
Two concentric circles are drawn with chord AB drawn on the larger circle.
AB cuts through the smaller circle at points C and D.
It is known that AC=7, CD=6, and DB=7.

What is the area between the two circles?

For comparison, the classic problem What's the area? is a version where the chord tangent to the inner circle.

See The Solution Submitted by Brian Smith    
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