code: function getIntersection(x0, y0, r0, x1, y1, r1) {
  	var dx = x1 - x0,
  		dy = y1 - y0,
  		d = sqrt(pow(dx, 2) + pow(dy, 2)),
  		a = (pow(d, 2) + pow(r0, 2) - pow(r1, 2)) / (2 * d),
  		x2 = x0 + (dx * a / d),
  		y2 = y0 + (dy * a / d),
  		h = sqrt(pow(r0, 2) - pow(a, 2)),
  		rx = -dy * (h / d),
  		ry = dx * (h / d),
  		xi = x2 + rx,
  		yi = y2 + ry;
  
  	// Check if circles do not intersect or overlap completely
  	if (d > (r0 + r1) || d < Math.abs(r0 - r1)) {
  		return false;
  	}
  	return [xi, yi];
  }
docs: Get the topmost intersection point of two circles