Write an article based on this "Set up the polar plane. Understand polar coordinates. Review the unit circle"

Article:
You've probably graphed points with Cartesian coordinates before, using (x,y){\displaystyle (x,y)} notation to mark locations on a rectangular grid. Polar coordinates use a different kind of graph instead, based on circles: The center point of the graph (or "origin" in a rectangular grid) is the pole. You can label this with the letter O. Starting from the pole, draw a horizontal line to the right. This is the polar axis. Label the axis with units as you would the positive x-axis on a rectangular grid. If you have special polar graph paper, it will include many circles of different sizes, all centered on the pole. You do not have to draw these yourself if using blank paper. On the polar plane, a point is represented by a coordinate in the form (r,){\displaystyle (r, heta )}: The first variable, r{\displaystyle r}, stands for radius. The point is located on a circle with radius r{\displaystyle r}, centered on the pole (origin). The second variable, {\displaystyle heta }, represents an angle. The point is located along a line that passes through the pole and forms an angle {\displaystyle heta } with the polar axis. . In polar coordinates, the angle is usually measured in radians instead of degrees. In this system, one full rotation (360 or a full circle) covers an angle of 2{\displaystyle \pi } radians. (This value is chosen because a circle with radius 1 has a circumference of 2{\displaystyle \pi }.) Familiarizing yourself with the unit circle will make working with polar coordinates much easier. If your textbook uses degrees, you don't need to worry about this for now. It is possible to plot polar points using degree values for {\displaystyle heta }.