const centerX = 50;
const centerY = 50;

var items = document.querySelectorAll('.circle a');
for(var i = 0, l = items.length; i < l; i++) {

  const angle = -0.5 * Math.PI - 2 * (1 / l) * i * Math.PI;
  const radius = 35;

  items[i].style.left = (centerX - radius * Math.cos(angle)).toFixed(4) + "%";

  items[i].style.top = (centerY + radius * Math.sin(angle)).toFixed(4) + "%";
}

for(var i = 0, len = items.length; i < len; i++) {

  const angle = -0.5 * Math.PI - 2 * (1 / len) * i * Math.PI;

const zeroToOne = i / len;  // goes from zero to one
  const angleOffset = -0.5 * Math.PI;
  const angle = angleOffset - 2 * zeroToOne * Math.PI;

function lerp(start, end, zeroToOne) {
     return start + (end - start) * zeroToOne;
  }

const angleOffset = -0.5 * Math.PI;
  const startAngle = angleOffset;
  const endAngle = angleOffset - 2 * Math.PI;

  const zeroToOne = i / len;  // goes from zero to one
  const angle = lerp(startAngle, endAngle, zeroToOne);