# geometry

abcd is a square picture frame. efgh is a square inscribed within abcd as a space for a picture. the area of efgh (for the picture) is equal to the area of the picture frame (the area of abcd minus the area of efgh). if AB=6, what is the length of EF

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1. efgh has half the area of abcd, so its side is 6/√2.

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posted by Steve

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