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## Homework Statement

z = 4y^2, x = 0, is rotated about the z axis. write the equation of the resulting surface in cylindrical coordinates

## Homework Equations

## The Attempt at a Solution

not really sure what the x = 0 means so i ignored it

i solved for y because that would be my radius ,y = (z/4)^1/2 = r

x = (z/4)^1/2*cos

y = (z/4)^1/2*sin

z = z

am i correct