Consider a 3d coordinate system with axis x,y and z.(adsbygoogle = window.adsbygoogle || []).push({});

We are given a circle on the x-z plane with function [tex]z^2 + (x-a)^2 = a^2[/tex]. We rotate this circle 90 degrees around the z-axis. What's the volume of the resulting surface?

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# What's the area of this volume?

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