Question: I wanna make a sphere not using a command Sphereplot

i want to make a solution that makes sphere not using Sphereplot()

i mean it`s fomula for a sphere that x^2+y^2+z^2=r^2

but, as you know

if i do like this


Warning, expecting only range variables [x, y] in expression x^2+y^2+z^2 to be plotted but found name z


how to make a sphere !?

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