polygons:
strokeColors: Color || Array of Colors
The line/border color of the spokes of the chart excluding the connector lines. If you want to pass more than 1 color, you can pass an array instead of a String.
strokeColors: '#e8e8e8' and strokeColors: ['#e8e8e8', '#f1f1f1'] both are valid.
strokeWidth: Number
Border width of the spokes of radar chart.
connectorColors: Color || Array of Colors
The line color of the connector lines of the polygons. If you want to pass more than 1 color, you can pass an array instead of a String.
connectorColors: '#e8e8e8' and connectorColors: ['#e8e8e8', '#f1f1f1'] both are valid.
fill:
colors: Array
The polygons can be filled with a custom color. If you provide 2 colors, the colors will be repeated for the rest of the polygons.