function wedge( container, blue, yellow, red, labeler )
{
const edgeMid = centroid( [ vertices[0], vertices[4] ] );
container .append("polygon")
.attr( "fill", labeler .color )
.attr( "stroke", "black" )
.attr( "stroke-width", "1" )
.attr( "points", [ vertices[0], center, edgeMid ] .map( d => d.join(",") ).join(" ") );
labeler .labelWedge( container, blue, yellow, red );
}