d3 arc.js

var vis = d3.select("body").append("svg")
var pi = Math.PI;
    
var arc = d3.svg.arc()
    .innerRadius(50)
    .outerRadius(70)
    .startAngle(-90 * (pi/180)) //converting from degs to radians
    .endAngle(90 * (pi/180)) //just radians
    
vis.attr("width", "400").attr("height", "400") // Added height and width so arc is visible
    .append("path")
    .attr("d", arc)
    .attr("fill", "red")
    .attr("transform", "translate(200,200)");