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Mathematics 15 Online
OpenStudy (anonymous):

The diagram below shows a square inside a regular octagon. The apothem of the octagon is 18.11 units. To the nearest square unit, what is the area of the shaded region? (picture) http://media.apexlearning.com/Images/200703/05/a715f259-fbc1-4b59-836c-f75cc36d76d0.gif

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