4 círculos (lie factor = 1) by aaizemberg

index.html

<!DOCTYPE html>
<html>
<head>
<script src="//d3js.org/d3.v3.min.js"></script>
  <meta charset="utf-8">
  <title>4 circulos</title>
</head>
<body>

  <script>
var h = 200, w = 500;
var data = [10,25,50,100];

var svg = d3.select("body")
            .append("svg")
            .attr("width",w)
            .attr("height",h);

var area = d3.scale.sqrt().domain([0, 100]).range([0, 50]);

var px = d3.scale.linear().domain([0, data.length-1]).range([w/(data.length+1), w - (w/(data.length+1)) ]);

svg.selectAll("circle").data(data).enter()
   .append("circle")
   .attr("cx", function(d,i) {return px(i);} )
   .attr("cy", h / 2)
// .attr("r", function(d) {return 6*Math.sqrt(d);});
   .attr("r", area );

  </script>
  
</body>
</html>