createCanvas(400,400)

  background(220, 255, 220);

  noStroke();

  fill(255,100,255);

  polygon(200,200,100,3)

}

​

function polygon(x, y, radius, npoints) {

​

  //degrees = radians × 180° / π

  //radians = degrees × π /180°

  var angle = TWO_PI / npoints;     // TWO_PI is the equivalent of 360 degrees

  console.log("radians: " + angle);

  console.log("degrees: " + (angle *180/PI));

​

  beginShape();

    var sx = x + cos(0) * radius;

    var sy = y + sin(0) * radius;

    vertex(sx, sy);

    console.log("sx, sy: " + sx + ", " + sy);

​

    var tx = x + cos(0 + angle) * radius;

    var ty = y + sin(0 + angle) * radius;

    vertex(tx, ty);

    console.log("tx, ty: " + tx + ", " + ty);

​

    var ux = x + cos(0 + angle + angle) * radius;

    var uy = y + sin(0 + angle + angle) * radius;

    vertex(ux, uy);

    console.log("ux, uy: " + ux + ", " + uy);

  endShape();

​

}

​