# Cartesian Co-ordinates and Polar Co-ordinates

#### JasonRox

Homework Helper
Gold Member
Just to make sure I got this right.

Cartesian is the popular x,y,z.

Polar is the one with degrees, and has a circular shape.

Is that it?

#### JasonRox

Homework Helper
Gold Member
Another question I kind of forgot about in High School. :(

When they say nEW, nEN, or xERe?

I know some mean rational, real, or what not.

Can anyone help?

#### HallsofIvy

Homework Helper
The only problem with your first post is that "x,y,z" is three dimensional and polar coordinates are two dimensional.

In two dimensions, the point (x,y) in Cartesian coordinates is (r,&theta;) in polar coordinates. r is the straight line distance from (0,0) to (x,y) and &theta; is the angle the line from (0,0) to (x,y) makes with the positive x-axis.
x= r cos(&theta;) and y= r sin(&theta).
r= &radic;(x2+ y2) and &theta;= arctan(y/x).

In three dimensions, one can use either "cylindrical coordinates" or "spherical coordinates" as an analog to polar coordinates.

#### JasonRox

Homework Helper
Gold Member
Thanks, that helps now.

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