[填空题]
The following diagram shows the graph eh*.zuhbgkq.fs9 z 9ljru 00+of thexecvopx;6dn 60k9pc- ks 8m 4ton +o4w function $f(x)=\frac{b}{a} \sqrt{a^{2}-x^{2}}$
Find an expression, in terms of a and b , for the volume of the solid formed by rotating the curve $360^{\circ} $ about the x -axis.
we get V=$\frac{x{\pi}ab^2}{y}$;x= ,y= .
