A square with side length of 4 inches is inscribed in circle K. Find the exact circumference of circle K.
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length of square = 4 inches
diameter of circle = diagonal of square
= 4√2 inches
Radius of circle = 2/√2 inches
= √2 inches
circumference = 2 π r
= 2 ×22× √2/7
= 44√2/7 inches