Finding volume using quad function

This is the problem I have to solve. I keep getting an error message though and can't figure out what's wrong with it.

Find the volume of revolving the area of the circle(x-6)^2 +(y-7)^2 =5 about the x-axis.

R= 7+sqrt(5-(x-6)^2)

r= 7-sqrt(5-(x-6)^2)

Volume= quad('circle',(6-sqrt(5)),(6+sqrt(5)))

function [ z ] = circle( R, r )

z= pi(R.)^2 -pi(r.)^2

end

Any help would be great! Thanks

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