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richyw
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Find the area of the part of the cylinder \(x^2+z^2=a^2\) that lies within the cylinder \(r^2=x^2+y^2=a^2\)
 one year ago
 one year ago
richyw Group Title
Find the area of the part of the cylinder \(x^2+z^2=a^2\) that lies within the cylinder \(r^2=x^2+y^2=a^2\)
 one year ago
 one year ago

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richyw Group TitleBest ResponseYou've already chosen the best response.0
let me type out what I have done so far
 one year ago

richyw Group TitleBest ResponseYou've already chosen the best response.0
\[z(x,y)=\sqrt{a^2x^2}\]\[z_x=\frac{x}{\sqrt{a^2x^2}}\]\[z_y=0\]\[dS=\sqrt{1+(z_x)^2+(z_y)^2}\,dA=\frac{a}{\sqrt{a^2x^2}}dA\]
 one year ago

richyw Group TitleBest ResponseYou've already chosen the best response.0
so I get lost from here. my solution manual says that the area is\[A=2\iint_D\frac{a}{\sqrt{a^2x^2}}dA\]Where D is the disk in which the vertical cylinder meets the xyplane
 one year ago

richyw Group TitleBest ResponseYou've already chosen the best response.0
where is that 2 coming from?
 one year ago

richyw Group TitleBest ResponseYou've already chosen the best response.0
oh ok because I let \(z(x,y)=\sqrt{a^2x^2}\) and it's really \(z(x,y)=\pm\sqrt{a^2x^2}\) so by symmetry the area will be twice that?
 one year ago
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