This one is fairly simple as it is nothing more than an extension of polar coordinates into three dimensions.

Not only is it an extension of polar coordinates, but we extend it into the third dimension just as we extend Cartesian coordinates into the third dimension. So, if we have a point in cylindrical coordinates the Cartesian coordinates can be found by using the following conversions.

Likewise, if we have a point in Cartesian coordinates the cylindrical coordinates can be found by using the following conversions. In two dimensions we know that this is a circle of radius 5.

From the section on quadric surfaces we know that this is the equation of a cone. Notes Quick Nav Download. Notes Practice Problems Assignment Problems.

You appear to be on a device with a "narrow" screen width i. 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.

## Chain rule - Derivative rules - AP Calculus AB - Khan Academy

Example 1 Identify the surface for each of the following equations. This equation will be easy to identify once we convert back to Cartesian coordinates.