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by William Armstrong
8 Dec 2012
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Annulus Puzzle

Genre: Geometry Puzzle Rating: 6 - Medium to Hard Source: Unknown
Brain Functions: Analysis, Exact Calculations Hint    Solution

There are two concentric circles. See the illustration below. A chord is tangent to the smaller circle and just reaches the edge of the larger circle. The chord is 1 inch long. What is the area of the annulus (the area inside the larger circle but outside the smaller circle)?

Annulus Puzzle

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