A Radar Chart plots the values of each category along a separate axis that radiates from the center of the chart and ends on the outer ring. A line connects all the values from the same series and optionally the area enclosed by the line can be filled. Radar Charts need a Value value for each data point. A Label value is also supported for each data point. Radar Charts are displayed with Radar Axes and Radar Wall. Following is a description of the radar chart settings:
Sub Type - defines the radar chart subtype. Possible values are:
Lines - displays each series as a line connecting the adjacent data points.
Areas - displays each series as a line connecting the adjacent data points and fills the enclosed area.