ABCD is a square picture frame (see figu...

ABCD is a square picture frame (see figure). 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 EF ?

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The correct Answer is:

`3sqrt2`

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