Paul's Online Notes
Home / Calculus III / 3-Dimensional Space / Cylindrical Coordinates
Show Mobile Notice Show All Notes Hide All Notes
Mobile Notice
You appear to be on a device with a "narrow" screen width (i.e. you are probably on a mobile phone). Due to the nature of the mathematics on this site it is best views in landscape mode. If your device is not in landscape mode many of the equations will run off the side of your device (should be able to scroll to see them) and some of the menu items will be cut off due to the narrow screen width.
Assignment Problems Notice
Please do not email me to get solutions and/or answers to these problems. I will not give them out under any circumstances nor will I respond to any requests to do so. The intent of these problems is for instructors to use them for assignments and having solutions/answers easily available defeats that purpose.

### Section 1-12 : Cylindrical Coordinates

For problems 1 & 2 convert the Cartesian coordinates for the point into Cylindrical coordinates.

1. $$\left( { - 3,5, - 8} \right)$$
2. $$\left( {4,1,7} \right)$$
3. Convert the following equation written in Cartesian coordinates into an equation in Cylindrical coordinates. $$\displaystyle \frac{{x - y}}{{{x^2} + {y^2} + 1}} = xyz$$

For problems 4 – 6 convert the equation written in Cylindrical coordinates into an equation in Cartesian coordinates.

1. $$z{r^3}\cos \left( \theta \right) = 4r + 8$$
2. $${r^2} - 3\sin \left( \theta \right) = {z^3} + \sqrt {{r^2} + 1}$$
3. $$\tan \left( \theta \right) + 2z = 1 - {r^2}$$

For problems 7 – 9 identify the surface generated by the given equation.

1. $$z = - 4r,\,\,\,z < 0$$
2. $$\displaystyle 2r + 6\cos \left( \theta \right) + 18\sin \left( \theta \right) = \frac{{51}}{r}$$
3. $$\theta = \frac{\pi }{3}$$