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<font face=TW Cen MT>Suppose a chord of a circle is 9 inches long and its midpoint is 6 inches from the center of the circle. Find the length of the radius.

How in the world do you figure that out?</font face=TW Cen MT>

You have a right triangle (centercircle, centercord, radius) You know two of the distances, solve for radius using the Pyh theorum .

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