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21 January, 14:56

Identify the surface whose equation is given r^2 + z^2 = 4

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  1. 21 January, 16:44
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    The equation describes a circle that gets smaller as z increases, and is maximum size at z=0. The radius of the circle is a maximum of 2, and goes to zero as |z| becomes 2.

    The surface is a sphere of radius 2 centered at the origin.
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