Fix distance between two points formula #2
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the method:
distance(x1, y1, x2, y2) {
return Math.sqrt((x1 - x2) * (x1 - x2) - (y1 - y2) * (y1 - y2));
}
should be:
distance(x1, y1, x2, y2) {
return Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
}