Generate Random Point in a Circle LeetCode solution in JavaScript

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var Solution = function (radius, x_center, y_center) {
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  this.radius = radius;
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  this.x_center = x_center;
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  this.y_center = y_center;
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};
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Solution.prototype.randPoint = function () {
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  let r = this.radius * Math.sqrt(Math.random());
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  let theta = Math.random() * 2 * Math.PI;
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  let x = this.x_center + r * Math.cos(theta);
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  let y = this.y_center + r * Math.sin(theta);
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  return [x, y];
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};