math
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one way to resize a ring is to fill a bar into the ring.suppose a ring that is 20 mm in diameter has to be resized to fit a fingure 16 mm n diameter
what is the length of the bar that should be inserted in order to make the ring fit the fingure? ( Hint: write an equation of the ring assuming it is centered at the origin. Determine what the ycoordinate of the bar must be and then substitute this coordinate into the equation to find x
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