Question 1195533
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(1)  The center of the ball is  15-6 = 9 cm below the water surface.


(2)  The radius of the horizontal circle is  {{{sqrt(15^2 - 9^2)}}} = 12 cm.


(3)  The circumference is  {{{12*(2*pi)}}} = {{{24pi}}} centimeters.    <U>ANSWER</U>
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Solved.