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elliptic cylinder centered at (0,0)
( x2 / a2 ) + ( y2 / b2 ) = 12
ellipsoid centered at (0,0,0)
( x2 / a2 ) + ( y2 / b2 ) + ( z2 / c2 ) = 12
cylinder wrapped around z-axis centered at (0,0) with radius 1
x2 + y2 = 12
circular double cone with the point in between both cones @ (0,0,0)
x2 + y2 = z2
aka z = sqrt(x2 + y2)
elliptic double cone with the point in between both cones @ (0,0,0)
( x2 / a2 ) + ( y2 / b2 ) = ( z2 / c2 )
aka sqrt[( x2 / a2 ) + ( y2 / b2 )] = | z / c |
*abs value because sqrt(x2) = |x|
parabloid centered at (0,0,0)
z = x2 + y2