| http://www.w3.org/ns/prov#value | - So a 3d coordinate system looks like this(the cube in the center is for visual aid)this coordinate system is composed of 3 planes, xy, xz, yz, so when you are graphing any old function likef(x) = x^2 this function graph is sitting on the z = k plane where k is a constant.So if z = 0 we get the 2d circle again.
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