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someone help me parameterize this surface

T

ThunderbirdElitist

Banned
X^2 + Y^2 + Z^2 = 4 ; z = sqrt(x^2+y^2)


I'm assuming sperical coordinates would be the easiest way.

I get x = 2sin(Ro)Cos(theta) ; y=2Sin(ro)Cos(theta) ; z=2Sin(Ro)


But this isn't correct.
 
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