Find the volume of the solid generated by revolving the region bounded by the graphs of the equations and inequalities about the $y$-axis.
$$x ^ { 2 } - y ^ { 2 } = 81 , x \geq 0 , y = - 9 , y = 9$$

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The Answer of Find the volume of the solid generated by revolving the region bounded by the graphs of the equations and inequalities about the $y$-axis.
$$x ^ { 2 } - y ^ { 2 } = 81 , x \geq 0 , y = - 9 , y = 9$$

Find the Volume of the Solid Generated by Revolving the Region