Polar Charts are radial charts, which are predominantly used to show mathematical functions. These charts use polar coordinate system, where its x-axis looks like a circle with the origin point as a center and each point is determined by distance from a fixed point and angle from a fixed direction. Polar Charts support line, spline, area and scatter series.
Here you can see graphs of the most popular mathematical functions – sin(x) and cos(x), drawn on a polar chart. Two series are in the chart, one for a function. X-axis is circular and holds the values from 0 to 360 degrees with an interval of 30 degrees. These values become an argument for the functions. The functions’ values are distributed along the y-axis; as sin and cos values are always in a range of [-1,1], the y-axis is created of [-1, 1.25] range with an interval of 0.25 in purpose of having a padding between the x-axis and extreme values. You can manage the series by using legend; click on a legend item to switch the series on and off; hover the items to highlight the series.