Question 1142714
{{{ C = 2*pi*r }}}
{{{ 22 = 2*pi*r }}}
{{{ r = 11/pi }}}
{{{ r = 3.5014 }}}
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The inner radius is:
{{{ 3.5014 - .6 = 2.9014 }}}
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If the ball were solid, the volume would be:
{{{V =  (4/3)*pi*r^3 }}}
{{{ V = (4/3)*pi*3.014^3 }}}
{{{ V = 4.1888*27.38 }}}
{{{ V = 114.689 }}} cm3
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The volume to subtract is:
{{{ V = (4/3)*pi*2.9014^3 }}}
{{{ V = 4.1888*24.424 }}}
{{{ V = 102.307 }}}
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{{{ V = 114.689 - 102.307 }}}
{{{ V = 12.382 }}} cm3 is the volume of the rubber in the ball
check the math